List of commercial video games with later released source code

This is a list of commercial video games with available source code. The source code of these commercially developed and distributed video games is available to the public or the games' communities.

For open source video games, see List of open source video games. For commercial games which were released as freeware without source code, see List of commercial video games released as freeware.

Motivation

Commercial video games are typically developed as proprietary closed source software products, with the source code treated as a trade secret (unlike open-source video games). When there is no more expected revenue, these games enter the end-of-life as a product with no support or availability for the game's users and community, becoming abandoned.

Description

In several of the cases listed here, the game's developers released the source code expressly to prevent their work from becoming abandonware. Such source code is often released under varying (free and non-free, commercial and non-commercial) software licenses to the games' communities or the public; artwork and data are often released under a different license than the source code, as the copyright situation is different or more complicated. The source code may be pushed by the developers to public repositories (e.g. SourceForge or GitHub), or given to selected game community members, or sold with the game, or become available by other means. The game may be written in an interpreted language such as BASIC or Python, and distributed as raw source code without being compiled; early software was often distributed in text form, as in the book BASIC Computer Games. In some cases when a game's source code is not available by other means, the game's community "reconstructs" source code from compiled binary files through time-demanding reverse engineering techniques. Source code availability in whatever form allows the games' communities to study how the game works, make modifications, and provide technical support themselves when the official support has ended, e.g. with unofficial patches to fix bugs or source ports to make the game compatible with new platforms.

List
Title First release Source code release Genre Engine license Content license Original developer Additional information
3-D Ultra Pinball: Thrill Ride 2000 2020 Pinball Proprietary Proprietary Left Field Productions On May 13, 2020, Dave Ashley added the source code of the Game Boy Color port to his Game Boy Color development repository.[1]
Abuse 1995 2003 Run and gun Public domain software Public domain and Proprietary* Crack dot Com Game source code was released as public domain along with the shareware-released media files.[2] Only shareware data, excluding the sound effects, is in the public domain; the rest is proprietary. In 2016 a community developer released a "20th anniversary source port"[3][4] which enabled custom resolutions, OpenGL rendering, Xbox 360 controller support and fixed the music.
Adventureland 1978 1980 Text Adventure game Public domain software Public domain Scott Adams Scott Adams Adventureland's[5] source code was published in SoftSide magazine in 1980[6] and the database format was subsequently used in other interpreters such as Brian Howarth's Mysterious Adventures series.[7]
Airline Tycoon 1998 2015 Simulation game Proprietary[8] Commercial Spellbound Entertainment On 24 March 2015 Airline Tycoon Deluxe was re-released on the digital distribution platform gog.com, including the source code.[9]
Alien 3 1992 2019 Run and gun Proprietary Proprietary Probe Software In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 version of the game to GitHub.[10]
Alien Bash I+II 1993 2014 Run and gun public domain software public domain[11] Glen Cumming Glen Cumming provided media and material of his Amiga games AlienBash and AlienBash II to the fan community, who was able to restore source code in 2014.[12]
Alien Breed 3D II: The Killing Grounds 1996 1997 FPS ? Proprietary Team17 In March 1997 Team17 made the source code of Alien Breed 3D and Alien Breed 3D II freely available on the cover CD of Amiga Format magazine issue 95.[13][14][15]
Alien vs Predator (Atari Jaguar game) 1994 2008 FPS ? Proprietary Rebellion Developments Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Aliens versus Predator 2000 2001[19] FPS Own non-commercial license[20] Proprietary Rebellion Developments Source code released by Rebellion Developments 2001. An unofficial patch project for the PC version, based on the source code, was released and is still updated.[19]
Alpha Waves 1990 2009 early 3D exploration game with platform aspects ? ? Christophe de Dinechin Released in 1990 as one of the earliest 3D games[21] with full 6-axis degree of freedom. In 2009, author Christophe de Dinechin released the complete assembly and GFA BASIC source code of the Atari ST version.[22][23] There is also a started PC port in C++ on SourceForge by the original author.[24][25]
Allegiance (now FreeAllegiance) 2000 2004 real-time strategy and Space combat simulator MIT license (earlier Shared Source[26]) Proprietary Microsoft Research Released by Microsoft Research under a shared source license ("MSR-SSLA") 2004.[27] On July 27, 2017 Microsoft Research changed the license from MSR shared source license to MIT license.[28]
Altered Beast 1989 2019 Beat 'em up Proprietary Proprietary Software Studios In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 conversion of the game to GitHub.[10]
Amulets & Armor 1997 2013 first person role-playing video game GPLv3 Freeware United Software Artists In 2013 Amulets & Armor was re-released as freeware on the game's official site and the source code under GPLv3 on GitHub.[29][30] Work continues for ports to newer systems (Windows, MacOS) and general bug fixes.[31][32]
Anacreon: Reconstruction 4021 1987 2004 4x game no license given Freeware George Moromisato Developed by George Moromisato in 1987. Around 2004 the source code of the DOS version 2.00 was released.[33]
Anachronox 2001 2001 (partly) RPG Proprietary Proprietary Ion Storm Some bits of code distributed with the official editor.
Anodyne 2013 2020 Action-adventure Anodyne License Anodyne License Analgesic Productions On April 4, 2020, Melos Han-Tani from Analgesic Productions released the source code of Anodyne under a custom permissive license.[34][35]
Ares (now Antares) 1996 2008 Space Strategy video game LGPLv3[36] CC BY-NC-SA Freeware Nathan Lamont/Bigger Planet Software Released in 2008. Under continued development for modern systems as "Antares" via GitHub.[37]
Army Men III 2016 2018 ? ? ? Neotl Empire Army Men III was under development until 2016. Two years later, the unfinished game was release as open source on SourceForge in April 2018.[38]
Arx Fatalis (now Arx Libertatis) 2002 2011 RPG GPL Proprietary Arkane Studios The design of Arx Fatalis was heavily influenced by Ultima Underworld. Game source released by Arkane Studios on January 14, 2011.[39] Based upon this source code the formed Arx Libertatis-project created Fan-made patches and Source ports.[40][41]
AstroMenace (now OpenAstroMenace) 2006 2007 Arcade GPLv3 CC BY-SA 3.0 Viewizard Based on AstroMenace which was released in February 2007 as shareware for Windows and freeware for Linux.[42] Also the source code of another Viewizard game, the puzzle collection Memonix, was released.[43]
Atomic Robo-Kid 1990 2019 Scrolling shooter Proprietary Proprietary Activision In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 conversion of the game to GitHub.[10]
Attack of the Mutant Camels 1989 2012 Scrolling shooters ? ? Jeff Minter In 2012 the assembly language source code of the Konix version of the game was released on GitHub.[44][45]
Aquaria 2007 2010 Action-adventure GPL Proprietary Bit Blot Open sourced with Humble Indie Bundle.[46]
Avara 1996 2016 Shooter game MIT License Proprietary Ambrosia Software / Juri Munkki The MacOS classic game became open source in 2016 when Munkki released the source code upon the game's 20th anniversary.[47]
Aztaka 2009 2011 Action role-playing game Proprietary Citérémis In 2011 Independent game developer Citérémis released a "Developer's Edition" of Aztaka for $9.99 which included also the source code of the game.[48][49]
Balance of Power 1985 2013 Government simulation game ? ? Chris Crawford In August 2013 Chris Crawford released source code of several of his games from his career to the public,[50] fulfilling a GDC 2011 given promise.[51] Beside Balance of Power he released all the source code he could recover, for instance Trust & Betrayal: The Legacy of Siboot, Excalibur, Gossip, Eastern Front (1941), Scram and Legionnaire.
Batman Returns 1993 2015 sidescrolling Beat 'em up for educational purposes for educational purposes ACME / Chris Shrigley In March 2015 programmer Chris Shrigley, who worked on the Sega CD version, found the Batman Returns source code and released it for educational purposes to the public.[52] He released also the source code of Magician, Cliffhanger, Gargoyles and some other games from his working career.[53]
Beauty & The Beast: A Boardgame Adventure 1999 2020 Board Proprietary Proprietary Left Field Productions On May 13, 2020, Dave Ashley added the source code of the game to his Game Boy Color development repository.[54]
Beneath a Steel Sky 1994 2003 Point and click adventure Beneath a Steel Sky Freeware License Beneath a Steel Sky Freeware License Revolution Software The assembly language source code of the game was made available to the public and ScummVM in August 2003.[55][56] The source code availability made it possible for the ScummVM project to support the game, which allows the game to be played on Windows, OS X, Linux, Windows CE and other compatible operating systems and platforms.
Beyond Castle Wolfenstein 1985 2005 Stealth game no license given Freeware Silas Warner The reconstructed source code and the ported game was released by Silas Warner's widow in 2005.[57]
Beyond Protocol (now After Protocol) 2008 2011 persistent, space MMORTS non-commercial public license Freeware Dark Sky Entertainment Initial design of Beyond Protocol began in 1991.[58] A scaled up beta program began Nov 15th 2007[59] with an open-beta in 2008. When due to financial issues the game has been shut down, the source code was released on 4 May 2011 on SourceForge to the public.[60] Based on this source code, community organized development continues until today as After Protocol.[61]
Beyond the Titanic 1986 2009 Text adventure GPLv2 Freeware Apogee Software Game source released on March 20, 2009.[62]
Blades of Exile 1997 2007 RPG GPL GPL Spiderweb Software Source code and artwork was released by Jeff Vogel (Spiderweb Software) under a GPL license in June 2007.[63]
Blake Stone: Planet Strike 1994 2013 FPS GPLv2 or later[64] Proprietary Apogee Software Released in 2013 to promote the sale of the Apogee Throwback Pack on Steam.[65][66]
Blood II: The Chosen 1998 1999 FPS Proprietary Proprietary Monolith Productions SDK released 1999, including the game logic for modders.[67] The Lithtech engine was not included as source code.
Blue Max 1983 2016 Scrolling shooter ? Proprietary Bob Pollin Assembly source code released in 2016 by the author Bob Pollin in the Atariage forum.[68] On the Atariage forum source code of many more games was released.[69][70][71]
Bob's game 2004 2016 puzzle, action RPG source available Freeware Robert Pelloni In August 2016 the source code of the game was released on GitHub under a non-commercial source available software license,[72] to allow the community to contribute. The author claims that he wrote the game originally in C, switched then to Java, and later converted it with an automatic code converter to C++.[73]
Breakout 2000 1996 2008 Action ? Proprietary MP Games Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Buzz Aldrin's Race Into Space (now Race Into Space) 1993 2007 Simulation GPLv2[74] Freeware[75] Strategic Visions/Fritz Bronner A port of Buzz Aldrin's Race Into Space to modern operating systems. The license fell back to Bronner as he had a contract clause with Interplay stating that in case Interplay went bankrupt or no distribution happened for some time.[75]
Catacomb 1989 2014[76] Top-down shooter GNU General Public License Proprietary Flat Rock Software Early game by John D. Carmack. Released by Flat Rock Software,[77] and ported to SDL.[78]
Catacomb 3D 1991 2014[76] FPS GNU General Public License Proprietary Flat Rock Software / id Software Predecessor to Wolfenstein 3D.
Call to Power II 2000 2003 turn-based strategy game Non-commercial own license[79] Proprietary Activision Civilization clone. Source opened to the apolyton community to allow support with Community patches.[80]
Canabalt 2009 2010 Cinematic platformer Engine MIT license,[81] game code own proprietary license[82] Proprietary / Freeware Adam Saltsman Released by Adam Saltsman in 2010.[83]
Captain Blood 1988 2017 Adventure, Simulation ? ? Exxos (ERE informatique) Apple IIgs sources released by Brutal Deluxe Software.[84][85]
Carnivores 2 1999 2013 Simulation ? Freeware Action Forms A version from 2013 is available on assembla.[86] Around 2017 the source code was released via Moddb.[87]
Cart Life 2011 2014 Simulation CART LIFE'S FREE LICENSE (Permissive license) CART LIFE'S FREE LICENSE (Permissive license) / Freeware Richard Hofmeier In March 2014 the game was removed from all digital distributions and the source code and game was made available for free online, with Hofmeier saying he was finished supporting the game.[88] His webpage went later offline[89] but the source code was mirrored on GitHub.[90][91]
Checkered Flag 1994 2008 Racing ? Proprietary Rebellion Developments Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Civilization IV 2005 2006 (partly) turn-based strategy Proprietary Proprietary Firaxis Games / 2k Games In April 2006 the developers released the source code of the core game mechanic to the public with a Software Development Kit.[92][93] Additionally to the released source code, as game data and rules are stored in XML files and most of the game is written in Python, much (but not all) of the game is "open" and easily customizable.[94] The game's community produced later many mods, total conversions and optimization patches for the game.[95]
Civilization V 2010 2012 (partly) turn-based strategy Proprietary Proprietary Firaxis Games / 2k Games In Fall 2012 the developers released the source code of the core game DLL.[96] The game's community produced later a community patch project.[97][98]
Clonk series (now OpenClonk) 1994 2010/2014 Action, RTS, Platform ISC CC BY-NC RedWolf Design / Matthes Bender For the series (Clonk 1, Clonk 2 Debakel, Clonk 3 Radikal, Clonk 4 World, Clonk Planet, Clonk Endeavor and Clonk Rage) the C++ source code was released under the "Clonk Source Code License (ISC License)".[99] The content of the original game series was released under the CC BY-NC.[100] Based on Clonk Rage code base the community continues the development as OpenClonk under ISC license and content as CC BY-SA.
Club Drive 1994 2008 Racing ? Proprietary Atari Corporation Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Colobot 2001 2012 Educational game, RTS GPLv3 GPLv3 Epsitec SA Game source released on March 26, 2012.[101]
Colossal Cave Adventure 1976 2000/2005 (?) Text Adventure Public domain software[102][103][104] / BSD license (2017) no artwork (Public domain software) Will Crowther Source code variants are at least available as far back as 2000.[105] An authentic version was retrieved in 2005 "from a backup of Don Woods's student account at the Stanford Artificial Intelligence Lab (SAIL)".[102] In February 2017 Eric S. Raymond was involved in the release of version 2.5, under BSD license, the last release by the original author alone.[106][107][108]
Commander Keen in Keen Dreams 1991 2014 Platformer GPLv2+ Proprietary id Software In September 2014, after an Indiegogo crowdfunding campaign,[109] the game's source code was released on GitHub.[110][111]
Contract J.A.C.K. 2003 2003 FPS Proprietary Proprietary Monolith Productions Game code distributed with the official editor (www.mpgh.net).
Conquest: Frontier Wars 2001 2013 Space Real-time strategy ? Proprietary Fever Pitch Studios On December 9, 2013, the source code was bundled with every copy of the game purchased on GOG.com.[112][113]
Cook, Serve, Delicious! 2012 2016 Business simulation game Proprietary Proprietary Vertigo Gaming Source code released in the Humble GameMaker Bundle on September 6, 2016.[114][115][116]
CoreBreach 2011 2012 Racing game GPL (game) / MIT (3D engine)[117] Freeware (demo) / proprietary CoreCode Futuristic "anti-gravity" racing game with combat. Source was released after a sales quota was met.[117]
Corncob 3D 1993 2016 Flight simulator Public domain software[118] Freeware Pie in the Sky / Kevin Stokes The game became around 2016 freeware and open source.[118]
Crazee Rider 1987 2019 Racing Proprietary Proprietary Superior Software In November 2018 the source code of Crazee Rider in BBC Micro 6502 assembly language was released by Kevin Edwards, designer of the game.[119] In April of the following year the source code for the Acorn Electron version was also released.[120]
CryEngine 5 2002[121] 2016 FPS ? NA Crytek In 2016 Crytek released their engine as pay-what-you-want including the source code to the public.[122][123]
Crysis 2007 ? FPS Proprietary Proprietary Crytek Game code was officially released with the SDK.
Crysis 2 2011 ? FPS Proprietary Proprietary Crytek Game code was officially released with the SDK.
Crystal Mines 1989 2011 Arcade Custom permissive license Freeware Ken Beckett / Color Dreams In August 2011 Ken Beckett, the programmer of the NES game Crystal Mines, released the source code under a custom permissive license to the public.[124][125] Artwork still proprietary but can be shared for non-commercial, personal use.[126]
Cortex Command 2012 2019 Action game GPLv3 Proprietary Data Realms LLC The indie game was in development since 2001, which won an IGF award in 2009,[127] was finally released in 2012.[128] In July 2019 the source code was released under GPLv3 on github.[129][130] As of end of 2019 the work on a community continuation, dubbed "Cortex-Command-Community-Project", is ongoing.[131]
Cybermorph 1993 2008 Shooter ? Proprietary Attention to Detail Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Cylindrix 1995 2001 Arcade, Shooter LGPL LGPL Goldtree Enterprises / Softdisk Around December 2001 the games was ported from DOS to Windows and released under the LGPL to the public.[132][133]
Cytadela (or The Citadel) 1995 2006 FPS GPLv2 GPLv2 Virtual Design Upon its retail release, Cytadela received generally favorable reviews.[134] In early 2006 the original Cytadela developer offered the Amiga source code of the FPS game to the community, which started a conversion project hosted on SourceForge.[135][136][137] Ported to several platforms, latest version released in 2013.
Daikatana 2000 2015 FPS ? Proprietary Ion Storm / John Romero Lacking any further official support after the closure of Ion Storm's Dallas office in 2001, John Romero gave the game's source code to community members, allowing them to develop additional platform ports and bug fixes.[138][139]
Dandy 1983 2018 Dungeon crawl Proprietary Proprietary John Howard Palevich In March 2018 the source code for the Atari 8-bit version was released by Kevin Savetz with permission of Palevich.[140]
DarkSpace 2001 2009 MMO, Real-time strategy multiple, self-written licenses.[141] Proprietary Palestar DarkSpace's game engine called Medusa released by Palestar under multiple licenses.[142]
Death & Taxes 2020 2020 Simulation game MIT license commercially Placeholder Gameworks After selling well the indie game's Unity source code was released on GitHub[143] to help other developers.[144][145]
Death Ray Manta 2012 2015 Arena shooter ? educational purposes Bagfull of Wrong / Rob Fearon The GameMaker Studio based game's source code was released in 2015 with a Humble Indie Bundle.[146] The assets followed in 2016.[147]
Delver 2012 2018 First-person action roguelike dungeon crawl Custom[148] Proprietary Priority Interrupt
Descent, Descent II 1995/1996 1997/1999 space 3D FPS own license[149] Proprietary Parallax Software Game source released by Parallax Software in 1997 (Descent 1)[150] and 1999 (Descent 2).[151] Descent 3 source code seems to be in hands of Rebecca Heineman and were considered 2014 for a release.[152]
Deus Ex (video game) 2000 ? FPS Proprietary Proprietary Ion Storm Headers and some code distributed with the official SDK.
Digger 1983 2004 Arcade Proprietary Freeware Windmill Software The original source code became available in September 2004 "for historical interest" (together with source code of other Windmill Software games as Styx).[153][154] There is also an earlier free software reverse engineered variant available by Andrew Jenner, called Digger Remastered, ported for many platforms.[155]
Dink Smallwood 1997 2003 Action RPG Zlib inspired own license[156] Zlib/Proprietary (Sound)[157] Robinson Technologies Source code published on July 17, 2003 from Seth Robinson.[158] 2008 Artwork published (without some sounds) under a Zlib license.[159] In October 2017 the HD version became fully open source and freeware, too.[160] The source code became available on GitHub shortly after.[161]
Discworld and Discworld II 1995 2008 point-and-click adventure game ? ? Teeny Weeny Games First announced for release around 2005 by Terry Pratchett,[162] source code became in 2008 available to the ScummVM developers.[163] The code was fast integrated into ScummVM.[164]
Disney's Aladdin 1993 2017 Platformer Proprietary Proprietary Disney Around 2017 the source code of the game became available to "The Video game history foundation", which wrote a review of the technique of the game based on the code.[165]
Dog Daze 1981 2014 Arcade game ? ? Gray Chang In 2014 Gray Chang released the source code of his Atari 400/800 games Dog Daze, Dog Daze Deluxe, Bumpomov's Dogs, and Claim Jumper.[166] Available at the Internet Archive.
Doom (Linux) 1993 1997/1999 FPS GPL Proprietary Id Software Game source released on December 23, 1997, placed under GPL on October 3, 1999.
Doom (Atari Jaguar) 1994 2003 FPS Proprietary Proprietary Id Software On April 27, 2003, the source code of the Atari Jaguar port of the game was released by Albert Yarusso of AtariAge with permission of John Carmack.[167]
Doom (3DO) 1995 2014 FPS MIT License Proprietary Art Data Interactive On November 30, 2014, the source code of the 3DO Interactive Multiplayer port of the game was released by Rebecca Heineman (sole developer of the port) under an MIT license, a different license than the Doom version for Linux and the Atari Jaguar port.[168][169][170][171]
Doom II: Hell on Earth 1994 1997/1999 FPS GPL Proprietary Id Software Game source released on December 23, 1997, placed under GPL on October 3, 1999.
Doom 3 2004 2011 FPS GPL Proprietary Id Software Game source released on November 22, 2011.[172]
Doom 3: BFG Edition 2012 2012 FPS GPLv3 Proprietary Id Software Source code released on November 26, 2012 on GitHub.[173]
Dragonfire 1982 2003 action public domain software public domain Imagic / Bob Smith Source code of this Imagic Atari 2600 game was released by developer Bob Smith on May 24, 2003 into the public domain.[174][175][176] Many more Atari games got disassembled and commented by the Atari community.[177]
DROD series 1997 2000 Puzzle game Mozilla Public license 1.1 (and other)[178] Proprietary Webfoot / Erik Hermansen After the author reacquired the rights to the game from the original publisher Webfoot,[179] he released the source code of the game engines.[178][180] The source code releases include DROD: King Dugan's Dungeon, DROD: Journey to Rooted Hold, DROD: The City Beneath, DROD: Gunthro and the Epic Blunder, DROD: The Second Sky, and DROD RPG: Tendry's Tale without its media assets.[181]
Duke Nukem 3D 1996 2003 FPS GPLv2 / Build license[182] Proprietary 3D Realms / Ken Silverman Game source released on April 1, 2003.[183] Update builds and source ports like eduke32 followed by the game's community.[184]
Dungeon Defenders 2010 2011 Tower defense ? Proprietary Trendy Entertainment In November 2011 there was a "development kit" released as free DLC which included the game's source code.[185]
Dungeons of Daggorath 1982 2001 3D Dungeon crawler Freeware Freeware DynaMicro / Douglas J. Morgan As for years there has been no production by the publisher Radio Shack of the game, the distributions rights fall back to the developers. Morgan released game around 2001 under a freeware like license to the public, also offering the source code.[186][187] Following, the game's community has created ports for PC,[188] Linux,[189] RiscOS[190] and PSP.[191]
Eat The Whistle - France 98 1998 2004 Sports game GPLv2[192] GPLv2 Hurricane Studios The France 98 football Simulation video game was released for the Amiga in 1998. Around 2004 Eat the Whistle was released under the GPL on Sourceforge, together with the point and click adventure Escape Towards The Unknown GPL.[193] Later ported to many other platforms.[194]
Eldritch 2013 2014 FPS, roguelike zlib license Proprietary Minor Key Games In April 2014, the game's source code was released to the public under a permissive zlib license. Content still proprietary and game being sold.[195][196]
Elite 1984 1999 Space trading game ? Freeware Ian Bell, David Braben In November 1999, developer Ian Bell released on the game's 15th birthday the BBC Micro assembly source code on his website.[197][198] Following that, Christian Pinder created a platform-neutral C version from the released BBC Micro version, called Elite: The new kind. In 1999–2000 a dispute occurred between Ian Bell and David Braben regarding Bell's decision to make available all versions of the original Elite.[199] The dispute has since ended and the various versions are now available again on Bell's site.[200][201]
Enemy Engaged: RAH-66 Comanche vs. KA-52 Hokum 2000 2003 Helicopter Flight simulator own license[202] Proprietary Razorworks Game source was released somewhen 2003 by Razorworks.[203]
Enemy Nations 1997 2005[204]
/2006[205][206]		 RTS own non-commercial license[207] non-commercial Freeware[207] Windward Studios Game source and artwork was released by Windward Studios under a non-commercial license around 2005/2006.
Far Cry (video game) 2004 ? FPS Proprietary Proprietary Crytek Game code was officially released with the SDK.
F.E.A.R. 2005 ? FPS Proprietary Proprietary Monolith Productions Headers and some code distributed with the official SDK.
Fight for Life 1996 2008 Fighting ? Proprietary Atari Corporation Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Fish Fillets (now Fish Fillets NG) 1998 2002 Puzzle GPL GPL Altar Games Released commercially as Fish Fillets in 1998. Source released in 2002 under the GPL.
Flotilla 2010 2020 3d tactic game Zlib license Proprietary Blendo Games Indie game developer Blendo games released the source code to Flotilla on its 10th release anniversary.[208][209] The source code is Zlib licensed on github, but assets are not included.[210]
Flow 2006 2009 Life simulation ? (For educational purposes) Freeware Thatgamecompany / Jenova Chen Around 2009 the flash source code was made available for educational purposes by the developers.[211][212]
Fort Apocalypse 1982 2015 action CC BY-NC-ND 2.5 CC BY-NC-ND 2.5 (Freeware) Steve Hales / Synapse Software In 2007 the Atari 8-bit game was relicensed to a CC BY-NC-ND 2.5 by Steve Hales and released on IgorLabs.[213] On April 23, 2015, Steve Hales released the assembler source code to Fort Apocalypse on GitHub, also under CC BY-NC-ND 2.5, for historical reasons.[214]
Free Fall 1983 1999 Beat 'em up ? Freeware Ian Bell / Acornsoft In 1999, developer Ian Bell released the video game's BBC Micro assembly source code on his website.[215] Semi-serious he considers it the first ever Beat 'em up video game.
Freedom Force 2002 2002 (partly) FPS Proprietary Proprietary Irrational Games Game logic written in Python. Scripts are located in the game directory.
FreeSpace 2 (now FreeSpace 2 Source Code Project) 1999 2002 Space Sim Non-commercial/Proprietary Proprietary Volition Game source released by Volition on April 25, 2002.[216]
Galaforce 1986 2019 Shoot 'em up Proprietary Proprietary Superior Software In March 2019 the source code of Galaforce in BBC Micro 6502 assembly language was released by Kevin Edwards, designer of the game.[217] In April of the same year Edwards released the source code for the Acorn Electron version.[218]
Gates of Skeldal 1998 2008 Dungeon crawler role-playing video game GPL 3 Freeware Napoleon Games On 19 November 2007 the game was made freeware by the Czech developer, in 2008 the source code was released under GPLv3 on a SourceForge repository.[219][220] Later it was translated by fans to English and ported to linux.[221]
Gish 2004 2010 Action GPL Proprietary Cryptic Sea Source opened with Humble Indie Bundle by Wolfire Games.[222][223]
Glider PRO 1994 2016 Flight simulator GPLv2 GPLv2 John Calhoun On 27 Jan 2016, the source code, graphics, and sound data for Glider PRO were released on GitHub with the source code being licensed under the GNU General Public License v2.[224][225]
Gladiator 1995 2002 top down perspective action game GPLv2 GPLv2 Forgotten Sages Games Released in 1995 as DOS shareware game,[226] in 2002 the game's source code was released under GPL by the developers. Development and porting by the game's community continued on SourceForge under the name OpenGlad.[227]
Glitch 2009 2013 MMO client and other parts under CC0 CC0 Tinyspeck In 2013, one year after the MMO was shut down, most of the artwork and parts of the code were released under the CC0 license.[228][229]
Gloom 1995 2017 FPS unlicense "for historical purposes" Black Magic In January 2017 the assembly and BlitzBasic 2 source code of the Amiga Doom clone Gloom was released as public domain software under unlicense on GitHub.[230] The assets were released "for historical and archiving purposes.".[231]
Glypha III 1990s 2016 Arcade MIT MIT John Calhoun On 27 Jan 2016, the source code, graphics, and sound data for Glypha III were released on GitHub with the source code being licensed under the MIT license.[232][233] Updated ports for MacOs and iPhone were created afterward.[234][235][236] A cross-platform OpenGL based port was released around May 2018 on GitHub.[237]
God of Thunder 1993 2020 Puzzle video game Public domain software Public domain (music and sound effects)
Proprietary (game graphics)		 Adept Software On March 27, 2020, Ron Davis released the source code and sound assets as public domain on SourceForge.[238]
Gothic 3 2006 2007 RPG Proprietary Proprietary JoWood Source code was opened by JoWood for the members of "Community patch project" from the game community in 2007.[239]
Grand Monster Slam 1989 2017 Fantasy sports game ? Proprietary Rolf Lakaemper, Hartwig Niedergassel In March 2017 the source code of the game became available via the Internet Archive.[240]
Gravity Force 2 1994 2008 Multidirectional shooter CC BY-SA 4.0 CC BY-SA 4.0 Jens Andersson & Jan Kronqvist On September 21, 2008 the developers of the Amiga shareware title Gravity Force 2 released the source code for "nostalgic interest" without specified license.[241] In April 2017 the authors clarified the game and source code license as CC BY-SA 4.0.[242]
Gunocide II 2000 2001 Galaga-like 2D shooter GPLv2 Freeware Alexander Bierbrauer and Oliver Weiler Developed around 2000.[243] After being succesless commercially published via a publisher,[244] the game was released as freeware and under GPL. 2002 ported to Linux and hosted on SourceForge as "G2ex".[245][246]
H-Craft Championship 2007 2015 science fiction racing game zlib license Freeware Irrgheist H-Craft Championship was developed by the independent game studio Irrgheist[247] and released by Manifesto Games[248]/Akella in 2007.[249] In 2014, the developers released the game as freeware[250] and the source code under the zlib license in February 2015.[251][252]
Habitat 1985 2016 early MMORPG MIT MIT Randy Farmer and Chip Morningstar/Lucasfilm Games The Museum of Art and Digital Entertainment received the game's source code from its original developers,[253] and restored the code in a Hackathon.[254] In July 2016, the source code was uploaded to GitHub under MIT license.[255][256]
Hack 'n' Slash 2014 2014 Zelda-like puzzle game ? Proprietary Double Fine With the 1.0 release on September 9, 2014 also the source code of the game was released by Double Fine.[257][258]
Hacker Evolution: Source code 2007 2015 Hacker game ? Proprietary Exosyphen Released on May 11, 2015 for $49.95 by the indie game developer.[259]
Hammerfight 2009 2011 2D physic based combat game zlib license[260] Proprietary Konstantin Koshutin For the third Humble Indie Bundle[261][262] Ryan C. Gordon ported the underlying game engine, "Haaf's Game Engine", to Linux and Mac OS X, and released source code under the zlib license.[263][264] Relish Games released the original version of HGE 1.8.1 for Windows/DirectX to GitHub under zlib license, too.[265]
Haunts: The Manse Macabre 2012 2012 turn based strategy BSD[266] CC BY-NC-SA Rick Dakan The 2012 with $29,000 crowdfunded[267] and in Go programmed game was put on GitHub after the money for further development run out.[268][269] While a volunteer keeps updating the almost finished prototype,[270] the against the Go 1.0 API build game fails to compile with newer compilers and Go versions.
Heartlight 1990 2005 Action-adventure ? ? X LanD Computer Games / Janusz Pelc The 8-bit Atari source code became available around 2005.[271] Other games like Robbo became available too.
Heavy Metal: F.A.K.K. 2 2000 2001 Action-adventure Proprietary Proprietary Ritual Entertainment Game code distributed with the official editing tools / SDK.
Heretic 1994 1999 FPS GPLv2 Proprietary Raven Software Game source released on January 11, 1999 under a very restrictive license,[272][273] relicensed to GPL on September 4, 2008.[274][275][276] The ACC script compiler was not included in the GPL re-release.
Heretic II 1998 1998 Action-adventure Proprietary Proprietary Raven Software Game code distributed with the official editing tools.
Hexen: Beyond Heretic 1995 1999 FPS GPLv2 Proprietary Raven Software Game source released on January 11, 1999 under a very restrictive license,[272][273] relicensed to GPL on September 4, 2008.[274][275][276] The ACC script compiler was not included in the GPL re-release.
Hexen II 1997 2000 FPS GPL Proprietary Raven Software Game source released on November 10, 2000.[277]
Highlander: The Last of the MacLeods 1995 2008 Action-adventure ? Proprietary Lore Design Limited Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Homeworld 1999 2003 Space Real-time strategy Non-commercial license[278] Proprietary Relic Entertainment Game source released 2003.[279] The source code became the base of several source ports to alternative platforms, like Mac,[280] Linux, Pandora,[281] Maemo/N900,[282] or Android[283][284] using the Simple DirectMedia Layer (SDL) cross-platform multimedia library. As the source code's license requirements limits further development significantly[285] the game's community aims for a re-licensing with the new IP holder Gearbox.[286] In September 2013 Gearbox responded positively to the idea for a re-licensing of the already published source code, noting their efforts in supporting the modding community.[287]
HoverRace 1996 2008 Racing originally time limited license / later non-commercial GrokkSoft HoverRace SourceCode License.[288][289] Freeware GrokkSoft Was first published under a time-limited license. In 2008 re-newed with an infinite duration license.[290]
Hover Strike 1995 2017 Shooter ? Proprietary Atari Corporation Made freely available on a Jaguar-dedicated Facebook group in May 2017.[291]
Hover Strike: Unconquered Lands 1995 2008 Shooter ? Proprietary Atari Corporation Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Hovertank 3D 1991 2014[76] FPS GNU General Public License Proprietary Flat Rock Software/id Software First 3D game by id Software and John D. Carmack.
Hundreds 2010 2010 Puzzle game ? ? Greg Wohlwend / Semi Secret Greg Wohlwend chose to open source his code in 2010,[292] partly with the intent to spur "non-coders" to try coding, as he had.[293][294] Programmer Eric Johnson of Semi Secret found the open source version and ported the game to iPad in a weekend before notifying Wohlwend,[293] which was later released commercially in an updated version.
Hypercycles 1995 2017 Shooter GPL freeware Bob Hays Released in January 2017 on GitHub.[295][296]
I-War (Atari Jaguar game) 1995 2008 Shooter ? Proprietary Imagitec Design Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
In Pursuit of Greed 1996 2014 FPS non-commercial use, "for educational and personal use only" Freeware (non-commercial) Mind Shear Software Based on Softdisk Publishing's "Raven engine" which powered also ShadowCaster. The game was released (including the engine) later by the developer as non-commercial freeware in 2014.[297][298][299]
Infinity 2002 2016 RPG Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License Freeware (non-commercial) Affinix Software Developed in 2002 as commercial Game Boy Color title (~90% finished) the game was never published. Finally released as non-commercial freeware with source code in August 2016.[300][301][302]
Inside a Star-Filled Sky 2011 2011 Top-down shooter public domain software public domain Jason Rohrer Inside a Star-filled Sky, for purchase for $12,[303] was put by developer Jason Rohrer into public domain,[304] like many other of his games.[305]
Jim Power in Mutant Planet 1992 2017 Platform game ? ? Digital Concept Around 2017 the source code of Jim Power was rescued by Piko Interactive.[306]
Iron Seed 1994 2013 Space trading and combat simulator GPL Freeware (audiotracks CC BY-SA by Andrew Sega) Channel 7 Released as freeware by the authors to promote the development of Iron Seed 2 in the 2000s. Source opened under the GPL by the developers in 2013.[307]
Kaiser II 1988 2003 economical simulation GPLv2 GPLv2 Carsten Strotmann In 2003 Kaiser II author Carsten Strotmann released the source code under the GPL as Free Software.[308][309]
Ken's Labyrinth 1993 2001 FPS Non-commercial license Freeware Ken Silverman Ken's Labyrinth was released as freeware on November 16, 1999. The source code under a non-commercial license followed on July 1, 2001.[310] A port to modern operating systems such as Windows and Linux using Simple DirectMedia Layer called LAB3D/SDL was created by Jan Lönnberg and released in 2002.[311] A version of the port which includes new higher resolution textures was also created by Jared Stafford.[312]
Kiloblaster 1992 2008 Arcade Own license[313] Freeware (with additional restriction) Epic MegaGames Allen Pilgrim declared the registered version freeware and released also the source code on August 4, 2008.[314][315]
Kingpin: Life of Crime 1999 ? FPS Proprietary Proprietary Xatrix Entertainment Game code distributed with the official SDK.
Kumquat & Cantaloupe 1996 2012 Maze undefined Freeware Dave Schofield The Amiga games Kumquat & Cantaloupe, originally released as shareware titles, were re-released as freeware with source code included by the author in November 2012.[316][317]
Kroz 1987 2009 Maze GPL Freeware Apogee Software Game source released on March 20, 2009.[62]
Larva Mortus 2008 2009 Top-down shooter only non commercial usage[318] Commercial Rake In Grass Czech independent video game developer Pavel Tovarys released the Torque 2D v1.1.3 based source code in 2009 under non-commercial conditions.[319][320] Several other games' source code were released too.[321] The code was taken offline after several games' IP were sold to another company. The source code is currently in no known repository on the web available.
Lemmings 1991 2010 Puzzle game ? ? Brutal Deluxe Brutal Deluxe released the source code of the Apple IIgs port of Lemmings[322] and a dozen other ports, like Neeka Electronic's Future Shock.[323]
Lemonade Stand 1973 1979 Business simulation game Public domain software (?) Freeware Bob Jamison, Charlie Kellner / MECC The Applesoft BASIC source code was available since 1979.[324][325] The game was later ported to modern REALbasic and released as free and open-source software for many platforms like Windows and MacOS.[326]
Lemma 2014 2014 Voxel FPS open world parcour[327] MIT Commercial Evan Todd Despite an unsuccessful crowdfunding campaign in 2014,[328] Lemma was released commercially by the developer DRM-free and also on Steam. The source code is openly developed and available on GitHub under a MIT license.[329][330]
The Little Mermaid II: Pinball Frenzy 2000 2020 Pinball Proprietary Proprietary Left Field Productions On May 11, 2020, Dave Ashley released the source code of the game on GitHub, along with a Game Boy Color emulator.[331]
The Lost Files of Sherlock Holmes: The Case of the Serrated Scalpel and The Case of the Rose Tattoo 1992 2015 Adventure Proprietary Proprietary Mythos Software On 2015 Electronic Arts gave source code for both games to the ScummVM Team for their inclusion in ScummVM.[332]
Lugaru 2005 2010 / 2016 (assets) Action-adventure game GPLv2 CC BY-SA 3.0 Wolfire Games Open sourced with the first Humble Indie Bundle by Wolfire Games.[333] In November 2016 David Rosen relicensed all assets under the open content CC BY-SA 3.0 Creative Commons license which makes Lugaru a fully free video game.[334] In begin 2017 an open source HD version followed.[335][336]
Magic Land Island (now Pocket Island) 2011 2012 Casual game MIT license CC BY-NC-SA Wooga Magic Land Island was launched during the GDC Europe in August 2011. In June 2012 the HTML5 game was open sourced under the name Pocket Island on GitHub under MIT license and with the assets under Creative Commons license CC BY-NC-SA.[337][338]
Magus 1995 2014 Rogue-like ? Freeware Ronny Wester Around 2014 archived on GitHub from other now offline sources.[339] A SDL port is in progress.[340] In 2000 Wester released also the Borland Pascal 7 source code of Cyberdogs (excluding some libraries he had licensed) on his website.[341]
Maelstrom 1992 1995/2010 Shoot 'em up GPL CC-BY Ambrosia Software Asteroids clone. 1995 source released under GPL. In 2010 Andrew Welch and Ian Gilman released the game's contents under a Creative Commons license.[342]
Marathon 2: Durandal (now Aleph One) 1995 2000 FPS GPL Proprietary Bungie Released by Bungie on January 17, 2000.[343]
MechCommander 2 2001 2006 Real-time tactics Shared Source Limited Permissive License[344] Proprietary FASA Interactive/Microsoft Source opened under a Shared Source license by Microsoft in August 2006.[345][346] As of 2017 there is a project fork on GitHub with the goal to port the source code to Linux.[347]
MegaBall 1991 2012 Breakout clone Apache license v2 Apache license v2 Mackey Software/Ed Mackey The Amiga game MegaBall was programmed by Mackey Software in 1991–1993. Inspired by Taito's Arkanoid it has several features more. The original author released in 2012 the source code of MegaBall under the Apache license v2.[348][349]
Meridian 59 1995 2012 MMORPG GPLv2 (excluding compression and audio libraries) Freeware Archetype Interactive As of February 2010 Meridian 59 has been turned over to the original technical developers, Andrew and Chris Kirmse. On September 15, 2012 they released the game to the public as Freeware and most of the source code under the GPLv2 license.[350]
Miner Wars 2081 2012 2013 6DOF Space Shooter game own proprietary license[351] Proprietary Keen Software House 6DOF action-survival space-shooter simulation-game set in the year 2081. Full game and engine source code released under a restrictive license.
Monster RPG 2 2010 2012 JRPG zlib license zlib license Nooskewl After a successful Indiegogo campaign, released by Nooskewl under a Public domain like license ("Give it Your Own License") on November 11, 2012.[352][353] Later changed to zlib license, and the content sold again to be able to pay the server bills.[354]
MiG Alley 1999 2001 Flight simulation own license Proprietary Rowan Software/Empire Interactive Source opened by Rowan Software/Empire Interactive in 2001.[355][356]
Mr. Do! (for Gameboy) 1992 2007 Arcade source opened without defined license without defined license Universal Entertainment Corporation Source opened of the game boy version by developer Wesley Knackers in 2007 on his website.[357][358]
Myth (series) 1998 2001 Real-time tactics source opened without defined license Proprietary Take 2 Interactive/MumboJumbo Source opened by Take 2 Interactive/MumboJumbo to the game community in 2001.[359][360]
Myst Online: Uru Live 2007 2010 MMORPG GPLv3 Proprietary Cyan Worlds "Myst Online: Uru Live" struggled to attract subscribers and was canceled after its first year. Cyan release the game as an open source game in 2010.[361]
Natural Selection 2002 2014 FPS GPLv2 (most code) / custom (external libraries)[362] Proprietary Unknown Worlds Entertainment In January 2014 Unknown Worlds released the source code for download on GitHub.[363]
Nanosaur 1998 2003 FPS Own restrictive license Proprietary Pangea Software Around 2003 the Nanosaur source code was made available by the developer under a restrictive license.[364]
Nemesis the Warlock 1987 2019 Action game Proprietary Proprietary Creative Reality In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 version of the game to GitHub.[10]
NoGravity 1996 2005 3D space space shooter / Wing Commander GPLv2 GPLv2 realtech VR Source code released by realtech VR on February 16, 2005.[365]
Nothing to Hide 2013 2013 Stealth game CC0 CC0 Nicky Case The crowdfunded surveillance/privacy-themed video game prototype by indie game developer Nicky Case was crowdfunded and opened under CC0 on GitHub between 2013 and 2015.[366][367][368][369][370]
The Operative: No One Lives Forever 2000 2010 FPS GPL Proprietary Monolith Productions In 2001, Monolith Productions released a set of editing tools for No One Lives Forever that included the level editor and model editor used for development.[371] The team also released the source code for NOLF (version 1.003 on Windows) that year to "support the fan base by offering the tools to create their own levels".[372][373] It is available both as a download, as well as on the Game of the Year Edition CD-ROM.[371] Years later around 2013 Lithtech source code became available on GitHub under GPL,[374] and work for merging game code and engine started.[375]
No One Lives Forever 2: A Spy in H.A.R.M.'s Way 2002 2011 FPS GPLv2[376] Proprietary Monolith Productions Source code released by Monolith Productions/Sierra Entertainment as part of a modding toolkit.[377]
Pararena 2 1992 2016 Action sport game MIT MIT John Calhoun On 27 Jan 2016, the source code was released on GitHub licensed under the MIT license.[378][379]
Pariah 2005 2005 (partly) FPS Proprietary Proprietary Digital Extremes Game code available on GitHub.[380]
PaybackTime 2 1997 2014 turn-based tactics game public domain software public domain Niko Nevatie and Kari Luojus The turn-based tactics game, inspired by Laser Squad and UFO: Enemy Unknown, was developed by two Finish students in Turbo Pascal and x86 assembly. They marketed their game as shareware for DOS in 1997.[381] The authors released the game in August 2014 as public domain software, including the assets.[382]
Penumbra: Overture 2007 2009 Survival horror with FPS aspects GPL Proprietary Frictional Games Developed by Swedish[383] developer Frictional Games, the game blends the genres of survival horror, first-person shooter, and adventure. Open sourced with Humble Indie Bundle.[384]
Pinball Construction Set 1983 2013 pinball video game MIT license MIT license Bill Budge, Electronic Arts In 2013, Budge released the source code to the Atari 800 and Apple II version of Pinball Construction Set to the public on GitHub under the MIT license.[385][386][387]
Pirate Adventure 1978 1980 adventure game ? ? Scott Adams (game designer) The source code for Pirate Adventure was printed in the December 1980 issue of BYTE, with an addendum in April 1981.[388][389] This enabled others to discover how the engine worked and to create their own adventures using this or a similar design.
Postal 1997 2016 Top-down shooter GPLv2 Proprietary Running with Scissors In 2015 the Running with Scissors developers announced that they will release the source code of the game "if someone promises to port it to the Dreamcast."[390] In June 2016 the developers gave the source code to a community developer who ported the game to Linux for the OpenPandora handheld.[391][392] On December 28, 2016, the source code was released on Bitbucket under the GPLv2.[393][394]
Postal 2 2003 2003 (partly?) FPS Proprietary Proprietary Running with Scissors Some game code and tools distributed with the official game release.
Preppie! 1982 2016 action game ? ? Russ Wetmore / Star Systems Software In January 2016 Russ Wetmore released the source code of his Atari 8-bit family games Preppie!, Preppie II and Sea Dragon to the public on the Internet Archive.[395]
Prince of Persia 1989 2012 Cinematic platformer Proprietary Proprietary Jordan Mechner Apple II source code was long-thought-lost,[396] but was found again and released in 2012.[397] A port of the assembly source code to C and SDL as backend was made by a community programmer.[398]
Project: Starfighter 2001 2008 Shoot 'em up GPL[399] Proprietary[400] Parallel Realities
Quake 1996 1999 FPS GPL Proprietary Id Software Game source released on December 21, 1999.
Quake II 1997 2001 FPS GPL Proprietary Id Software Game source released on December 22, 2001.
Quake III Arena 1999 2005 FPS GPL Proprietary Id Software Game source released on August 19, 2005.
Rampage 1988 2019 Action game Proprietary Proprietary Software Studios, Catalyst Coders In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 conversion of the game to GitHub.[10]
Return to Castle Wolfenstein 2001 2010 FPS GPLv3 Proprietary Gray Matter Interactive/Nerve Software The source code for Return to Castle Wolfenstein and Enemy Territory was released under the GNU General Public License (GPL) on August 12, 2010.[401][402]
Revenge of the Titans 2010 2011 Tower Defense, RTS Custom all-permissive[403] Proprietary Puppy Games Java based game. Source code was released by Puppy Games with the success of the second Humble Indie Bundle.[404]
Rise of the Triad 1994 2002 FPS GPLv2 Proprietary Apogee Software/3D Realms Game source released on December 20, 2002.[405]
Roboforge 2001 2008 Multiplayer Strategy game "RoboForge, Personal, Non-Commercial Use End User License" Freeware Liquid Edge Announced the game in July, 2000[406] by Liquid Edge the game was released on May 23, 2001.[407] From July 2008 RoboForge became an Open Source project with the source code for the Java-based client and server under a non-commercial license and as freeware.[408] The game's community continues development.
Rocky Racers 2002[409] 2004[410] Racing game Non-Commercial license Freeware Positech Games Released around 2002 by Positech Games, the game's C++ source code was released in July 2004 to the public for free.[411]
Rowan's Battle of Britain 2000 2001 Flight simulation Empire Interactive License Proprietary Rowan Software/Empire Interactive Source opened by Rowan Software/Empire Interactive in 2001.[355][412]
Rune 1999 2000 FPS Proprietary Proprietary Human Head Studios Headers and some code distributed with the official SDK.
RuneSword II 2001 2004[413] Turn-based strategy Public domain software[414] Public Domain CrossCut Games In 2004 CrossCut Games released the game into the public domain on SourceForge.[415] Since then there is continuous development by the community on the game.[416]
Ryzom 2004 2010 MMORPG AGPL CC Nevrax In response to the folding of Nevrax, the Free Ryzom Campaign was launched in order to gather enough funds from donations ("Crowdfunding") from the community to purchase Ryzom and release the game as free software. The campaign was almost successful with €172,988 of the required €200,000 gathered.[417][418] On May 6, 2010, Winch Gate announced the full release of source code and artwork, and a partnership with the Free Software Foundation.[419][420]
Savage: The Battle for Newerth 2003 2007 online Real-time strategy, FPS no license/proprietary Freeware[421] S2 Games The game was turned freeware by S2 Games on September 1, 2006. In 2007 the source code became available to the game community,[422] who now continues development.[423]
Savant - Ascent 2013 2015 Action Proprietary Proprietary D-Pad Studio Source code released in the Humble Weekly Bundle: Play and Create with GameMaker on September 17, 2015.[424][425]
Sea Dogs: An Epic Adventure at Sea 2000 2009 pirate game ? Proprietary Akella In 2009 Akella agreed to hand the source code of Sea Dogs' game engine to the game community on end-of-support.[426]
Serious Sam (Serious Engine) 2001 2016 FPS GPLv2+ Proprietary Croteam In March 2016, Croteam released Serious Engine v1.10 as free and open-source software on GitHub under the GNU General Public License.[427][428]
Seven Kingdoms 1996 2008 RTS GPL GPL and Proprietary* Enlight Source code released by Enlight in November, 2008. *Music is proprietary[429][430]
Seven Kingdoms II 1999 2009 RTS GPL Proprietary Enlight Source code released in August, 2009.
Severance: Blade of Darkness 2001 2001 (partly) FPS Proprietary Proprietary Rebel Act Studios Game logic written in Python. Scripts are located in the game directory.
Shadowgun: Deadzone 2011 2015 Shoot 'em up SHADOWGUN: DEADZONE PUBLIC LICENSE AGREEMENT[431] Proprietary Madfinger Games Game source and assets of the Unity 3.5 game were released some years after release.[432]
Shadowgrounds 2005 2011 Shoot 'em up own non-commercial license[433] Proprietary Frozenbyte Game source released with a Humble Indie Bundle by Frozenbyte on April 22, 2011.[434]
Shadow Warrior 1997 2005 FPS GPLv2 Proprietary 3D Realms Game source released on April 1, 2005.[435]
Shogo: Mobile Armor Division 1998 1998 FPS GPL Proprietary Monolith Productions SDK released 1998, including the game logic for modders.[436] The Lithtech engine was not included as source code. Years later around 2013 Lithtech source code became available on GitHub under GPL,[374] and work for merging game code and engine started.[375] On end of 2019 this Lith-tech engine reworks achieved a compiling under Windows state for NOLF2, while work continues.[437]
Siege of Avalon 2000 2003 RPG LGPL Proprietary Digital Tome Source code released June 23, 2003.[438] Later one of the original developers announced the preparation of a re-release of SOA, but nothing came out of it.[439]

In September 2017 a community developer managed to fix the dependencies of the Open source release, recompile the executable, fixing several bugs and introducing higher resolution support for the game.[440]

Silent Hunter II 2001 2002 submarine simulation ? Proprietary Ubisoft Around 2002 Ubisoft had ended the official support while still significant issues existed. Therefore, Ubisoft enabled the game's community at Subsim.com to fix the game themselves by giving them the source code.[441] The fans raised $7000 for an unofficial patch development project which fixed most of the issues.[441] The community extended Silent Hunter II also content wise significantly with expansion packs or texture upgrades.[442][443]
SimCity (Micropolis) 1989 (as SimCity) 2008 (as Micropolis) City-building game GPLv3[444] GPLv3 Maxis (Will Wright/Don Hopkins) Source code released by Don Hopkins under GPL in 2008. For trademark reasons released under the original working title Micropolis, also known as OLPC SimCity.[445]
Sin & SiN: Wages of Sin 1998 1998 FPS Proprietary Proprietary Ritual Entertainment Game code was officially released.
Sissyfight 2000 Returns 2014 2018 Multiplayer MIT license CC BY Zimmerman, Clark, and Bhatnagar On April 30, 2013, Zimmerman, Clark, and Bhatnagar announced a crowdfunding campaign on Kickstarter to revive Sissyfight.[446] The campaign was funded on May 30, 2013 with a final total of $22,735.[447] First Beta versions were released 2014. On February 9, 2018 the source code was released under the open source MIT license and the assets under the CC BY Creative Commons license on GitHub.[448]
Sláine 1987 2019 Adventure Proprietary Proprietary Creative Reality In May 19, 2019, Michael J. Archer uploaded the source code for the Commodore 64 version of the game to GitHub.[10]
Soldat 2002 2020 Run and gun MIT License Proprietary Team Soldat Source code was released under MIT license on GitHub.[449][450]
Soliter 1994 2009[451] Puzzle game ? Freeware Oldsoft Zdnek Stary developed at the Czech development studio Oldsoft the solitair game Soliter for the ZX Spectrum which got released in 1994. The game was released by the author in 2005 on his homepage for download, in 2009 the assembly source code followed as scan.[452]
Soldier of Fortune 2000 ? FPS Proprietary Proprietary Raven Software Game code distributed with the official SDK.
Soldier of Fortune II: Double Helix 2002 ? FPS Proprietary Proprietary Raven Software Game code distributed with the official SDK.
Solstice 2016 2016 Visual novel Proprietary Proprietary MoaCube Source code released in the Humble GameMaker Bundle on September 6, 2016.[114][115][116]
Sopwith 1984 2000 Shoot 'em up GPL GPL David L. Clark The C and x86 assembly source code to Sopwith was released in 2000,[453] at first under a non-commercial use license, but later under the GNU GPL at the request of fans.[454]
Soul Ride 2000[455] 2003 Snow board simulation/sport game GPL[456] Proprietary Slingshot Game Technology On 20 Jan 2003 Soul Ride's game engine source code was released to allow ports to alternative OSes.[457]
Spacebase DF-9 2013 2015 Space simulator CPAL ? Double Fine After Double Fine ended the support of the controversy ridden and incomplete game on end of 2014,[458] fans have been working to continue the game's development with the availability of the source code in May 2015 under the CPAL open-source license.[459] First patch became available in October 2015.[460]
Space Engineers 2013 2015 space sandbox game Proprietary commercial Keen Software House On May 14, 2015 the development studio made the source code freely available to the game's community for easier modding on GitHub under a proprietary license (non-open source license).[461][462][463]
Spacewar! 1962 2003 (?) Space combat ? ? Steve Russell Source code became available around the 2003.[464]
Spear of Destiny 1992 1995 FPS ID SOFTWARE LICENSE[465] Proprietary id Software The source code of Wolfenstein 3D, which also covered Spear of Destiny, was released on July 21, 1995.
Speed Haste 1995 2012 racing video game public domain like license Proprietary Javier Arevalo Baeza In 2012 the game's developer Javier Arevalo Baeza released the Borland C source code (minus some commercial library part) for "you can do whatever you want with this code" on GitHub.[466]
Planet Blupi 1997 2017 Platformer GPLv3 GPLv3 Epsitec SA / Daniel Roux, Denis Dumoulin, Mathieu Schroeter Planet Blupie was freed (source code and all media files) and ported to all major platforms (Linux, macOS and Windows) for its 20th anniversary, released Open source under GPLv3 on GitHub in 2017.[467][468] Speedy Blupi, part of Blupi series, has been released as freeware by EPSITEC too and is available at blupi.org.[469]
Star Control II (now The Ur-Quan Masters) 1992 2002 Action RPG GPL Cc-by-nc-sa Toys for Bob (Fred Ford / Paul Reiche III) Source code of the 3DO version GPL-released in 2002.[470]
Star Raiders 1979 2015 space combat simulator ? ? Aric Wilmunder / Atari The commented assembly source code scan of Star Raider became available in October 2015 in the Internet Archive as scan.[471] Aric Wilmunder opened it up with several other artifacts of his gaming career (e.g. SCUMM).[472] The community typed in the source code double checked in a GitHub project.[473] Shortly before a reverse engineering project was finished, too.[474] A true sequel, also called Star Raiders II, had been under development for some time by Aric Wilmunder. The never released prototype source code was posted publicly in December 2015.[475]
Star Ruler 2 2015[476] 2018 Real-time strategy, 4X MIT license CC BY-SA Blind Mind Studios Released on GitHub as an open-source project, including assets under the CC-BY-NC (but not music) on July 22, 2018.[477][478]
Star Trek: Voyager – Elite Force 2000 2000 FPS Proprietary Proprietary Raven Software Game code distributed with the official GDK.
Star Trek: Elite Force II 2002 2003 FPS non-commercial own license (only serverside part) Proprietary Ritual Entertainment In November 2003 Ritual Entertainment released the source code of their server-side code base for multiplayer gaming under a non-commercial license.[479][480]
Star Wars Jedi Knight II: Jedi Outcast 2002 2013 First/Third person shooter GPLv2 Proprietary Raven Software Release of the source code by Raven Software and Activision coincided with the closing of LucasArts by Disney.[481]
Star Wars Jedi Knight: Jedi Academy 2003 2013 First/Third person shooter GPLv2 Proprietary Raven Software Release of the source code by Raven Software and Activision coincided with the closing of LucasArts by Disney.[481]
Starshatter: The Gathering Storm 2004 2011 Space combat simulator New BSD License Freeware Destroyer Studios / Matrix Games Source code released by Destroyer Studios/Matrix Games on December 14, 2011.[482][483]
Stealth Bastard Deluxe 2012 2015 Stealth Proprietary Proprietary Curve Digital Source code released in the Humble Weekly Bundle: Play and Create with GameMaker on September 17, 2015.[424][425]
Strange Adventures in Infinite Space 2002 2005/2009 Space Roguelike GPL Freeware Digital Eel Source was released under GPL by Digital Eel in 2005.[484][485] Content became freeware 2009.[486]
Strife: Veteran Edition (Strife remaster) 1996 2014 FPS GPLv3 Proprietary Samuel Villarreal / Night Dive Studios In December 2014, Night Dive Studios coordinated the re-release of the 1996 first-person shooter role playing hybrid game Strife as Strife: Veteran Edition, after acquiring rights to the game. Because the game's source code had been lost, a derivative of the Chocolate Doom subproject Chocolate Strife was used as the game's engine, with its original programmers being contracted to do additional coding for the re-release. The source code of Strife: Veteran Edition has been made available under GPLv3 on GitHub by Samuel Villarreal and Night Dive Studios on December 12, 2014.[487] While this was the first source code opened for a Night Dive Studios Studio's game, it was announced more will follow,[488] for instance for System Shock 1.[489]
Stunt Copter mid 1980 ? Arcade Public domain software Public domain Duane Blehm / HomeTown Software After Duane Blehm death in 1988, his parents released Stunt Copter's and his other games' (like ZeroGravity, Cairo Shootout and PUZZ'L) binaries and source code into the public domain.[490]
Stellar Conquest III: Hostile Takeover 1994[491] 2006 Stellar Conquest inspired Space simulation open source freeware (non-commercial) Freeware (non-commercial redistribution allowed) NecroBones / Ed T. Toton III The Turbo Pascal 6 source code for the VGA DOS game was released in February 2006 together with the game itself as freeware by the developer.[492]
Stellar Frontier 1997 2008 Space simulation STARDOCK SHARED SOURCE STELLAR FRONTIER LICENSE (non-commercial license)[493] STARDOCK SHARED SOURCE STELLAR FRONTIER LICENSE (non-commercial license) Stardock Stellar Frontier was developed by Doug Hendrix in 1995 and was later licensed and published by Stardock. On August 4, 2006, Stardock Systems closed the official master server. On November 18, 2008, the game source code was released under an own non-commercial license.[494] As result, the game's community took over the support of the game and improved the game, fixed the bugs and security holes with self-made patches.[495]
Super Lemon Factory 2012 2012 Text adventure Proprietary Proprietary Initialsgames Based on the Cannabalt engine for iOS, and inspired by it to release the source code.[496][497]
Supernova 1987 2009 Text adventure GPLv2 Freeware Apogee Software Game source released on March 20, 2009.[62]
System Shock 1994 2018 FPS GPLv3 Proprietary Night Dive Studios In April 2018 the Mac version's source code was released by Night Dive on GitHub,[498] fulfilling a 2016 promise.[488][489][499] After one month of development, a cross-platform source port, called "Shockolate", for modern compilers and platforms was released by community developer Chad Cuddigan.[500]
Taxman 1981 201? pacman clone ? ? H.A.L. Labs / Brian Fitzgerald Apple II pacman clone from 1981. In August 2015 Rebecca Heineman announced that original developer Brian Fitzgerald allowed to release the source code.[501][502] GitHub repository is still empty as of October 2018.[503]
Team 47: GoMan 1997[504][505] 1998 Mech game public domain software public domain 47-TEK Released artwork and source code to public in May 1998.[506][507] As the Internet Archive has not saved the content of the now offline GoMan page in the end of the 1990s, currently there are no known mirrors on the web; the source code seems as of 2017 to be lost.[507]
Tempest 2000 (Atari Jaguar) 1994 2008 Tube shooter ? Proprietary Llamasoft Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Terminal Velocity 1995 2015 flight game ? ? Mark Randel / Terminal Reality Became available under a NDA in June 2015.[508] Work on an updated version for modern system started immediately.[509]
The Clue! 1994 2000 role-playing adventure game own license own license / Freeware Neo Software In 2000 the source code was released to the public.[510][511] The game is since then ported to modern platforms via SDL and receives still updates by the community (2015).[512]
The Guild of Thieves 1987 2017 adventure game ? ? Magnetic Scrolls In June 2017 Magnetic Scrolls worked on recovering the source code of their classics from tapes to remaster and re-release them.[513][514]
The Wizard's Castle 1980 2004 role-playing adventure game ? ? Joseph R. Power The BASIC source code of the 1980 developed game was published by the developer in the July/August 1980 issue of Recreational Computing.[515][516] Ports to other systems followed afterwards.[517]
The Pit Puzzle 1997 2011 Puzzle game Apache 2.0 License Freeware[518] Abe Pralle / Plasmaworks The DOS game source code was released around 2011 by the author Abe Pralle under Apache 2.0 License on GitHub.[519]
The Wheel of Time 1999 1999 FPS Proprietary Proprietary Legend Entertainment Game code and tools distributed with the official game release.
To Heart 2 2004 2006 Visual novel GPL Proprietary Aquaplus Its source code was released by Aquaplus under the GNU General Public License on December 22, 2005 along with the source code for Arurū to Asobo!!, Tears to Tiara, and Kusari.[520][521] This decision was made due to the inclusion of Xvid derived code; Xvid being distributed under the same license.[520][521] The source code for all four games is distributed upon request in CD-R format.[520] A copy of the original source code is hosted on GitHub,[522] as also an continued engine project.[523]
To the Moon 2011 2014 role-playing game GPLv2 Proprietary Freebird Games To the Moon was developed using RPG Maker XP engine in 2011. In January 2014 To the Moon was also released for OS X and Linux with the Humble Bundle X.[524] Edward Rudd ported the game with the GPLv2 RPG Maker XP game engine recreation MKXP,[524][525] other ports followed later.[526] Also a successor game by Freebird games, "A Bird Story", was ported to Linux under usage of MKXP.[527]
Tornado 1993 2017 combat flight simulator ? Proprietary Digital Integration / Interplay Entertainment In March 2016 in the Tornado's community forum, rumors surfaced that Interplay Entertainment was working on a re-release of the game for digital distribution, based on the original source code.[528] The assembly source code finally surfaced in January 2017 on github.com.[529][530]
Tread Marks 2000 2017 Tank Combat/Racing GPLv3 Freeware Longbow Digital Arts / Seumas McNally Won in 2000 the Seumas McNally Grand Prize. On January 20, 2017 the source code was released as open source on github.com and the game itself as freeware.[531][532] A port to Linux and MacOS is in progress.[533] In September 2017 a version for the Linux-based OpenPandora was released.[534]
Treasures of a Slaver's Kingdom 2007 2010 Z-machine Text adventure game Freeware Freeware Cumberland Games & Diversions S. John Ross released the commercial Treasures of a Slaver's Kingdom, which won the XYZZY Award 2007 for the best NPC, in 2010 with Z-machine source code as freeware.[535] More source code of text adventure from the 1970s and 1980s are available at the archive.[536]
Trevor McFur in the Crescent Galaxy 1993 2008 Shoot 'em up ? Proprietary Flare II Released by defunct Jaguar Sector II website under a CD compilation for PC titled Jaguar Source Code Collection on August 24, 2008.[16][17] Source code was provided by Atari historian Curt Vendel.[18]
Tribal Trouble 2005 2014 RTS GPLv2 Freeware Oddlabs In September 2014 the game's source code was released to the public on GitHub and is now open source under the GPLv2.[537] Development continues in a community fork.[538]
Tribes 2 2001 2012 FPS Torque engine under MIT, rest is proprietary Freeware Dynamix Many commercial titles were developed using the Torque engine.[539] GarageGames released Torque 3D under the MIT License on September 20, 2012.[540] The Tribes 2 source code beside the Torque engine is not available.[541]
Tron 2.0 2003 2009 FPS ? ? Monolith Productions Source code released with Lithtech Jupiter Enterprise b69 engine.
Triplane Turmoil 1996 2009 side-scrolling dogfighting flying game GPLv3 GPLv3 Dodekaedron Software In 1996 Triplane Turmoil was originally released as shareware DOS game. In 2009 Dodekaedron Software Creations Oy placed Triplane Turmoil's source code, documentation, images and sounds under the GPLv3, hosted on Sourceforge.[542][543] The community continued the support and ported the game to other platforms (Linux, Windows) via SDL.
Tyrian (now OpenTyrian) 1995 2007 Scrolling shooter GPLv2 Freeware/CC-BY 3.0 US[544][545] World Tree Games Productions / Epic MegaGames (Jason Emery, Daniel Cook) The OpenTyrian team ported the closed-source Pascal code of Tyrian to C with permission of Jason Emery in February 2007. The graphic artist Daniel Cook released the artwork shortly after.
Ultima: Escape from Mt. Drash 1983 2003 Role-playing video game Proprietary Proprietary Keith Zabalaoui / Sierra On-Line On 11 June 2003, the game was ported to PC (under GPLv2 license) by Kasper Fauerby based on the original BASIC source code and some smaller binary reverse engineered parts.[546]
Unreal 1998 2008 FPS source opened to the community under NDA Proprietary Epic MegaGames Headers and some code distributed with the official SDK. Also, some pre-release version (v0.87) is available on the internet. Around 2008 access to source-code was granted by Epic MegaGames for the game community.[547] In 2015 Tim Sweeney announced that he hope to be able to open source one day the engine to the public.[548]
Unreal Tournament 99 1999 ? FPS Proprietary Proprietary Epic Games, Digital Extremes, Legend Entertainment Headers and some code distributed with the official SDK.
Unreal Tournament 2003 2002 ? FPS Proprietary Proprietary Epic Games Game code was officially released.
Unreal Tournament 2004 2004 ? FPS Proprietary Proprietary Epic Games Game code was officially released.
Unreal Tournament 3 2007 ? FPS Proprietary Proprietary Epic Games Game code was officially released.
Uplink 2001 2003 Hacking simulation Proprietary Proprietary Introversion Software Mid-2003 Introversion Software started selling the source code for $45. Usage beside modding and fixing of the game are not permitted by the license.[549] Source code of the games Darwinia + Multiwinia and DEFCON was later sold too.[550]
Unreal II: The Awakening 2003 ? FPS Proprietary Proprietary Legend Entertainment Game code and tools distributed with the official game release.
Urban Chaos 1999 2017 Action-adventure game MIT license Proprietary Mucky Foot In May 2017 Mucky Foot's Mike Diskett released the source code of Urban Chaos under the MIT license on GitHub.[551]
Vangers 1998 2016 racing and role-playing genre GPLv3 Commercial K-D Lab In March 2016, Vangers source code was released[552] under GPLv3 license. Data was not freed though, so one still needs data files from Steam or GOG.com released in order to run the game.
Video Checkers 1980 2020 Board Proprietary Proprietary Atari, Inc. On April 8, 2020, Kay Savetz uploaded scans of the complete source code of the revision A of Video Checkers (a first-party video game for the Atari 2600) to the Internet Archive donated by its developer Carol Shaw.[553]
VGA Civil War Strategy Game 1995 2017 turn based strategy MIT MIT W. R. Hutsell In 2017 Mr. Hutsell gave the source code of VGA Civil War Strategy Game to Dave Mackey, who ported the game for modern platforms (Windows, Mac, Linux) with the help of SDL and other open source libraries from QuickBASIC to QB64.[554] The source code is released on GitHub under a MIT license.[555]
Vox 2013 2015 open world simulation GPLv3 commercial AlwaysGeeky Games Vox started life as an entry into the Ludum Dare competition.[556][557] The game was successfully Steam Greenlighted on November 12, 2013.[558] Around end of 2015 the source code of Vox was made available as open-source software under the GPLv3 on GitHub.[559]
Voxelquest 2014 2016 open world simulation MIT MIT Gavan Woolery After a successful crowdfunding project on Kickstarter to develop an open-world simulation game in 2014,[560] Gavan Woolery developed several iterations of the game's engine. After running out of funding for further development, he open-sourced with support of the backers the game's engine on github.com under MIT license in August 2016.[561][562]
VVVVVV 2010 2020 platformer source available Proprietary Terry Cavanagh On the 10th anniversary of the game's release in January 2020, Kavanagh released the source code[563] for VVVVVV under a non-open source "VVVVVV Source Code License v1.0"[564] via GitHub.[565]
Wander 1974 2015 Text adventure public domain (?) public domain (?) Peter Langston In April 2015 the lost thought source code of Wander, one of the earliest mainframe text adventures, could be acquired from the original author.[566][567]
Warlords Battlecry III 2004 2006 RTS Own proprietary license Proprietary Infinite Interactive/Enlight Software On 24 May 2006, the Warlords Battlecry III source code became available to the public. Members of the community (who signed a NDA) have been entitled distributors, which have the legal permissions to allocate copies of the Warlords Battlecry III source code.[568][569] The source code release resulted in the development of several community-made fan patches[570][571] and mods.
War Worlds 2013 2014 RTS Own permissive license[572] Own permissive license Codeka / Dean Harding The mobile strategy game was originally released commercially,[573] and later released to the public to allow the community to continue the support of the game.[574][575] With help of the community the game's main developer has continued the support since then.
Warfare Incorporated (now Hostile Takeover) 2003 2014 RTS BSD license BSD license Spiffcode In July 2014 the game's source code and content got open sourced with the BSD license under the name "Hostile Takeover" on GitHub.[576][577] As result the game was ported by the game's community to alternative platforms like the Pandora handheld.[578]
Warzone 2100 1999 2004/2008 RTS GPLv2 GPLv2, CC Pumpkin Studios/Eidos Interactive 3D real-time strategy game with a unit design system. First source part was released by Pumpkin Studios/Eidos Interactive in 2004 and the rest was released in 2008.[579]
Witchaven series 1995 2006 FPS non-given Proprietary Capstone Software Around 2006 Les Bird, a programmer from the 1996 folded game development company Capstone Software, released the source code of the abandoned games Witchaven, Witchaven II, William Shatner's TekWar and Corridor 7: Alien Invasion.[580]
Wolfenstein 3D 1992 1995 FPS ID SOFTWARE LICENSE[465] Proprietary id Software The source code of Wolfenstein 3D, which also covered Spear of Destiny, was released on July 21, 1995.
Wolfenstein: Enemy Territory 2003 2010 FPS GPLv3 Proprietary Splash Damage/id Software Game source released on August 12, 2010.[581][402][401]
Word Whiz 1988 2009 Educational game GPLv2 Freeware Apogee Software Game source released on March 20, 2009.[62]
World in Conflict (server code) 2007 2017 Real time strategy game GPLv2[582] Proprietary Ubisoft Game source released in 2017 by ubisoft after support ended in 2014.[583]
World Train Royale 2009 2011 Tycoon game ? Freeware Versus Software Sold around 2009 for 10 dollars,[584] the game source code was released on 26 June 2011 on SourceForge.[585][586]
Worms Armageddon 1999 2002 Deathmatch game ? Commercial Team17 Around 2002 Team17, impressed by the reverse engineering on Worms Armageddon for "Silkworm",[587] gave David "Deadcode" Ellsworth access to the source code.[588] Over the next years he created unofficial patches, until he joined Team17 in 2006. Updates are still created as of 2015.[589]
Xargon 1993 2008 Platformer own license[313] Freeware (with additional restrictions) Epic MegaGames Game source released in 2008 by the programmer Allen Pilgrim.[590] A SDL port followed later by Malvineous.[591]
Xenonauts 2014 2015 Turn-based tactics ? Proprietary Goldhawk Interactive Shortly after the release of the stable version Goldhawk Interactive allowed selected members of the community to access the source code.[592] This resulted in the community edition of the game (Xenonauts:Community Edition, X:CE), which continues development of an independent branch of the game, adding new features and bugfixes.[593]
XIII 2003 2018 (partly) FPS Proprietary Proprietary Ubisoft Paris The UnrealScript source code of the game was made available on GitHub in January 2018.[594]
Zork (also known as Dungeon or Dungeon Adventure) 1977 1978 Text adventure Public domain software Public domain Robert M. Supnik / Infocom Public domain software ports with source code based on the first "Dungeon" version of Zork, are available in various repositories.[595][596] Also, Infocom allowed the distribution of the early Fortran version. Original version from MIT.[597][598]

See also

References
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  99. Source Code "The complete source code of the following Clonk versions is available: Clonk Rage (current version) (engine, tools, and editor, VC6/VC7/VC9/MinGW/gcc/xcode) Clonk Endeavour 4.95.5 (engine only, VC6 or MinGW) Clonk Planet 4.65 (engine only, VC6) Clonk 3 Radikal (MS-DOS, Borland Turbo C++) Clonk 2 Debakel (MS-DOS, Borland Turbo C++) Clonk 1 (MS-DOS, Borland Turbo C++ [...] Clonk Source Code License (ISC License) Copyright (c) 2001-2014, RedWolf Design GmbH, http://www.clonk.de Archived 2006-01-14 at the Wayback Machine"
  100. Developer "Clonk Game Content License Clonk game content is available under the following license. This applies to graphics, audio data, scripting, and text found in the game release packages (usually packed inside c4f, c4g, and c4d group files). Creative Commons Attribution-NonCommercial (CC BY-NC)"
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  126. Crystal%20Mines%20(NES)%2011151989%20Version.zip in "Crystal Mines License.txt" "Ken's license: - The name "Crystal Mines", the graphics, sound, music, and the levels are NOT open source. People other than me worked on them, and for that version of the game actually got royalties and still have ownership. It's OK to possess them for personal use, but they can't be reused in a new game or distributed for profit. - As the sole author of the code, I (Ken Beckett) will allow the source code for the NES version to be used in other works, provided that: A) Credit is given to 'Ken Beckett' in both the portions of re-used source code AND in the credits of the new game, and B) That the code is modified sufficiently such that the new game is not easily recognizable as being Crystal Mines with new graphics/sound/music. -Ken"
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  462. Rosa, Marek (2015-05-14). "Space Engineers – full source code access, total modifications and 100,000 USD fund". marekrosa.org. Archived from the original on 2015-06-22. Retrieved 2015-06-16. Today we have a very important announcement for our modders and our community. We decided to give you 100% complete access to Space Engineers’ source code. This comes as a continuation of our decision to give more freedom to modders and community.
  463. SpaceEngineers Archived 2015-08-11 at the Wayback Machine on GitHub
  464. Spacewar! assembly source code on textfiles.com
  465. LICENSE.DOC on github.com/id-Software/wolf3d
  466. Speed Haste Game Source Code Archived 2016-07-21 at the Wayback Machine on github.com (February 13, 2012)
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  474. Starraiders Archived 2016-04-01 at Archive.today on github.com/lwiest
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  481. Plunkett, Luke (2013-04-03). "Lucasarts' Closure Convinces Developers To Release Awesome Star Wars Source Code". Kotaku. Archived from the original on 2013-04-07. Retrieved 2013-04-04. In the wake of Lucasarts' closure today, Raven - the developers of the thoroughly excellent Jedi Outcast - have decided to release the source code for the game. Oh, and the code for its sequel, Jedi Academy, as well.
  482. Rubin, Brian (2012-01-16). "Starshatter: The Gathering Storm Goes Open Source!". spacegamejunkie.com. Archived from the original on 2012-06-15. Retrieved 2013-01-08. Apparently the excellent and unique military space sim, Starshatter: The Gathering Storm, has gone open source thanks to its original developer releasing the source code. [...]: "14 DEC, 2011 – STARSHATTER:THE GATHERING STORM – Open Source Version 5.0.5. This download Includes the cumulative Starshatter-TGS game up to version 5.0.5 (No CD Required). It is available for download from our “Lagacy Official File” section."
  483. doctorfrog (2012-02-06). "Because Stars Matter: Starshatter (Sci-Fi Flight Sim) is Free!". drfrog.wordpress.com. Archived from the original on 2012-01-27. Retrieved 2012-01-08. Starshatter: The Gathering Storm is a moderately complex, moderately realistic, spaceborne military flight sim that takes place in a series of dynamic campaigns.
  484. source Archived 2016-07-21 at the Wayback Machine on digital-eel.com
  485. sais Archived 2012-12-26 at the Wayback Machine on infinitespacegames.com "After being sold for several years by Cheapass Games, Strange Adventures in Infinite Space was released as free software and its source code was made available under the GNU General Public License. Go to the Strange Adventures in Infinite Space website to download the game, source code and various other goodies"
  486. strange-adventures-in-infinite-space-free Archived 2016-06-04 at the Wayback Machine on Rock, Paper, Shotgun (2009-10-07)
  487. Villarreal, Samuel (December 12, 2014). "Strife Veteran Edition GPL Source Release". GitHub. Archived from the original on July 21, 2016. Retrieved July 1, 2016.
  488. IamA Founder of Night Dive Studios, Stephen Kick - We track down and restore classic video games! AMA! Archived 2016-07-21 at the Wayback Machine by Stephen Kick on reddit.com "Lost source code is one of the things that genuinely depress me and we're currently evaluating the idea of releasing the code we've discovered and restored to anyone who wants to store it or modify it.[...] We have released the source to Strife: Veteran Edition and we are planning on releasing more code in the future." (22 June 2016)
  489. System Shock Remake Feedback Request - Night Dive Studios on systemshock.org "We've also tracked down the source code to the original game and will be releasing it to the community once it's ready." (10 February 2016)
  490. Duane Blehm's Source Code on macintoshgarden.org "Source Code for Duane Blehm's games (Stunt Copter, ZeroGravity, Cairo Shootout), released into the public domain by his parents after his passing."
  491. stellar-conquest-3-hostile-takeover Archived 2017-03-13 at the Wayback Machine on MobyGames
  492. NecroBones DOS Shareware/Freeware Games & Demos Archived 2016-10-21 at the Wayback Machine on necrobones.com/
  493. stellar_frontier_source_eula.txt STARDOCK SHARED SOURCE STELLAR FRONTIER LICENSE (mirror Archived 2015-11-23 at the Wayback Machine)
  494. "Stellar Frontier Source Code – Released". stellarfrontier.ss-network.net. 2008-11-18. Archived from the original on December 31, 2009. Retrieved 2013-10-13. As of Tuesday, November 18, 2008, the Stellar Frontier source code has officially been released by Stardock Corporation. End-User License Agreement was updated June 19th 2010.
  495. Stellar Frontier Development Log Archived 2015-08-01 at Archive.today on nexus.stellarfrontier.net/
  496. SLF_SOURCE Archived 2016-07-21 at the Wayback Machine on github.com
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  508. "I have access to Terminal Velocity, Fury3, and Hellbender's official source codes."
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  520. "弊社製品のムービー再生にxvid.orgのムービー展開ライブラリを使用していた件について。" [Announcement Concerning Our Company's Use of Xvid.org's Video Codec Library for Video Playback in Products] (in Japanese). Aquaplus. 2005-12-22. Archived from the original on 2006-11-26. Retrieved 2010-12-18.
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  532. TreadMarks Archived 2017-05-23 at the Wayback Machine on github.com
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  540. "It's here! The MIT licensed Torque 3D GitHub repo is ready!". Archived from the original on 2012-09-24.
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  543. Triplane Classic - a side-scrolling dogfighting game Archived 2016-07-21 at the Wayback Machine on github.com
  544. Free game graphics: Tyrian ships and tiles Archived 2012-12-28 at the Wayback Machine Daniel Cook (2007-04-04)
  545. Lost garden license Archived 2012-12-28 at the Wayback Machine
  546. Escape from Mount Drash Archived 2016-07-21 at the Wayback Machine on peroxide.dk "was ported from the Vic20 to PC by Telemachos. Included in the download is the sourcecode for the project. Mount Drash 0.4 Mb .zip" (2003)
  547. Meer, Alec (2012-10-12). "Patchy Like It's 1998: Unreal 1 Updated". rockpapershotgun.com. Archived from the original on 2013-01-15. Retrieved 2012-12-21. The list of fixes upon fixes are too long to mention here, but the essential purpose of v227 is to add DirectX9 and OpenAL support as well as mending everything that needs mending. Epic are aware of and permit the patch [...]
  548. Epic’s Tim Sweeney Says That Unreal Engine 1 May One Day Go Open Source on dsog.com by John Papadopoulos (January 19, 2015)
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  550. The Source Code Archived 2012-12-30 at the Wayback Machine We get bored easily and once we've finished a game we want to work on something completely different. But wait, what if there's other cool stuff that could be done that we left out? If you are a programmer you can take any of our games to the next level by becoming a developer. Buy access to our hosted SVN repo and get forum access to chat about your mods with the rest of the community.
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  553. Savetz, Kay [@KaySavetz] (8 April 2020). "Carol Shaw sent me the source code for Checkers for the Atari 2600, asking me to share it online. I carefully photographed it and uploaded it to @internetarchive. Perhaps someone will turn it into a text source code file" (Tweet). Archived from the original on 17 April 2020. Retrieved 17 April 2020 – via Twitter.
  554. Civil War Strategy Game 2.10 RELEASED! on hutsellgames.com
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  566. Wander (1974) — a lost mainframe game is found! Archived 2015-11-17 at the Wayback Machine on April 22, 2015
  567. Wander (1974) release, and questions answered Archived 2015-11-17 at the Wayback Machine
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  571. links to prominent mods and unofficial patches for WBC3 Archived 2014-08-12 at the Wayback Machine on gog.com (2014)
  572. license Archived 2016-07-21 at the Wayback Machine on github.com/codeka
  573. shutting down Archived 2016-07-21 at the Wayback Machine "The game had about 45,000 downloads in total. At its peak, there were about 2,000 7-day active players and I was making around $150 per month."
  574. war-worlds-is-shutting-down Archived 2016-03-03 at the Wayback Machine on war-worlds.com
  575. wwmmo Archived 2016-07-21 at the Wayback Machine on github.com
  576. Warfare Incorporated has been open sourced Archived 2016-05-14 at the Wayback Machine on warfareincorporated.com by Scott Lu (2014)
  577. hostile-takeover Archived 2016-07-21 at the Wayback Machine on github.com
  578. Warfare Incorporated now Open Source Hostile Takeover Archived 2016-05-09 at the Wayback Machine on pyra-handheld.com (2015)
  579. Updated GPL release readme Archived 2013-03-08 at the Wayback Machine by Jay Walker (eidos) (11 Jun 2008)
  580. "Capstone Source Archive". Lesbird.com. Archived from the original on 2015-06-21. Retrieved 2015-06-21.
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  582. massgate on GitHub
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  584. world-train-royale on gamersgate.com
  585. world-train-royale-is-free-as-in-beer-and-speech Archived 2016-02-15 at the Wayback Machine on versus-software.com (2011)
  586. trainroyale Archived 2016-03-14 at the Wayback Machine on sourceforge.com
  587. Silkworm Archived 2017-03-23 at the Wayback Machine on worms2d.info
  588. Deadcode Archived 2017-03-23 at the Wayback Machine on worms2d.info
  589. Updates_(Worms_Armageddon) Archived 2017-03-23 at the Wayback Machine on worms2d.info
  590. Allen Pilgrim declared Xargon freeware and released the source code. Archived 2012-08-28 at the Wayback Machine on classicdosgames.com
  591. xargon Archived 2017-05-05 at the Wayback Machine on github.com
  592. "Community Coder Program!". goldhawkinteractive. Archived from the original on 2015-07-10. Retrieved 2015-07-09.
  593. "What is Xenonauts: Community Edition & how do I get it?". goldhawkinteractive.com. Archived from the original on 2015-07-10. Retrieved 2015-07-09.
  594. xiii_unrealscript on GitHub
  595. The DUNGEON (Zork I) source Archived 2016-07-21 at the Wayback Machine on github.com/devshane/zork
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  597. itafroma/zork-mdl
  598. zork-source-code-is-a-master-class-in-game-developer-trolling

References
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