List of open-source video games
This is a selected list of free/libre and open-source video games. Open-source video games are games assembled from and are themselves open-source software, including public domain games with published source code. This list includes games in which the game engine is open-source but the game content (media and levels, for example) may be under a different license.
Open engine and free content
The games in this table are developed under a free and open-source license with free content which allows reuse, modification and commercial redistribution of the whole game. Licenses can be a public domain, GPL license, BSD license, Creative Commons License, zlib license, MIT license, Artistic License and more (see the comparison of Free and open-source software and the Comparison of free and open-source software licenses).
|Title||First release||Last release||Genre||Engine license||Content license||Dimensions||Other information|
|0 A.D.||2009||2016||RTS||GPLv2+||CC BY-SA 3.0||3D||Historical, cross-platform RTS, using an original engine named Pyrogenesis. Game source-code released July 10, 2009.|
|2048||2014||2014||Puzzle||MIT||MIT||2D||A sliding block puzzle game.|
|Abuse||1996||2011||Run and gun||Public domain software||Public domain||2D|
|Armagetron Advanced||2001||2015||Racing||GPLv2+||GPLv2+||3D||A multiplayer, 3D Tron lightcycle racing game.|
|AstroMenace||2007||2013||Arcade||GPLv3+||GPLv3+, CC BY-SA 4.0||3D||A top-scrolling space shooter.|
|Ballerburg||1987||2008 (ports)||Artillery game||Public domain software||Public domain||2D||Public domain software on the authors website with source code. Later ported to other systems as Linux, MacOS, iOS etc.|
|Battle for Wesnoth, The||2005||2016||TBТ||GPLv2||GPLv2||2D||Turn-based tactical strategy game with RPG elements. Includes single-player campaign and skirmish modes as well as multiplayer.|
|Blob Wars||2003||2009||Platformer, Action-adventure||GPLv2||GPLv2, CC BY-SA, other open source||2D, 3D||?|
|Bos Wars||2004||2013||RTS||GPLv2||GPLv2||Isometric 2D||2D RTS running on a modified version of the Stratagus engine.|
|BZFlag||1997||2016||Tank FPS||LGPLv2.1||LGPLv2.1||3D||A first-person shooter 3D tank based multiplayer online game.|
|C-Dogs SDL||2002||2016||Run and gun||GPLv2||CC0, CC BY, CC BY-SA||2D||Overhead run and gun, with hotseat co-operative and deathmatch play for up to four players.|
|Candy Box 2||2013||2013||incremental browser video game||GPLv3||GPLv3||2D||The typescript source code of Candybox2 was released under the GPLv3.|
|Cataclysm: Dark Days Ahead||2013||2015||RPG/Roguelike||CC BY-SA||CC BY-SA||2D||A post-apocalyptic, survival roguelike with an open-ended gameplay. Had a successful crowdfunding campaign on kickstarter.com on 22 June 2013.|
|Chromium B.S.U.||2000||2013||Arcade||Clarified Artistic||MIT||?||A fast paced, arcade-style, top-scrolling space shooter|
|Colobot||2001||2012||RTS, Educational||GPLv3+||GPLv3+||3D||Source code released in 2012|
|Colossal Cave Adventure||1976||1995||Text adventure||Public domain software||Public domain||Text||The original text adventure game by Crowther / Woods.|
|Crossfire||1992||2014||MMORPG||GPLv2+||GPLv2+||?||Crossfire originally started as a Gauntlet clone developed by Frank Tore Johansen at the University of Oslo, Norway.|
|Diamond Trust of London||2012||2012||TBS||Public domain software||Public domain||2D||Following a Kickstarter crowdfunding campaign Diamond Trust of London was developed by Jason Rohrer and published by indiePub. On August 28, 2012 it was released for the Nintendo DS. The game has been placed in the public domain, hosted on SourceForge, like most of Rohrer's games.|
|Dungeon Crawl Stone Soup||2006||2016||Roguelike||GPLv2+||CC0||?||An open-source fork of the 1997 game Linley's Dungeon Crawl.|
|Endgame: Singularity||2005||2011||science fiction/AI simulation game||GPLv2||GPLv2||2D||written in Python|
|Fish Fillets NG||2004||2011||Puzzle||GPLv2||GPLv2||?||Released commercially as Fish Fillets in 1998. Source released in 2002 under the GPL.|
|FlightGear||1997||2016||Flight Sim||GPLv2||GPLv2||3D||Microsoft Flight Simulator inspired clone.|
|Freeciv||1996||2016||TBS||GPLv2||GPLv2||Isometric 2D||Civilization II clone.|
|FreeCol||2003||2015||TBS||GPLv2||GPLv2||Isometric 2D||Sid Meier's Colonization clone.|
|Freedoom||1993 (2001)||2015||FPS||BSD 3-clause||BSD 3-clause||2.5D||Doom content/resource clone.|
|Frozen Bubble||2002||2008||Puzzle||GPLv2||GPLv2||2D||Puzzle Bobble clone.|
|Gang Garrison 2||2008||2016||Shooter||MPLv2||MPLv2||2D||A retro "demake" of Team Fortress 2. The project was previously been under GPLv3.|
|Glest||2004||2008||RTS||GPL||CC BY-SA||3D||3D RTS game with two factions, A.I. and same-platform networking support. Development ceased in 2008. Two forks exist, named MegaGlest and Glest Advanced Engine.|
|Globulation 2||2008||2009||RTS||GPLv3||GPLv3||2D||Currently[when?] in open beta.|
|GLtron||2003||2016||Racing||GPL||GPL||3D||Based on the light cycle portion of the film Tron.|
|GNOME Games||1997||2016||Various||GPL||GPL||?||A collection of games accompanying the rest of the GNOME desktop environment.|
|Hedgewars||2007||2015||Artillery game||GPLv2||GPLv2||2D||Worms clone.|
|kdegames||1997 1998||2009||Various*||GPLv2||GPLv2||*Collection of games provided with the official release of KDE.|
|kiki the nano bot||2003||2007||Puzzle||Public domain software||Public domain||?||Mixture of Sokoban and Kula World.|
|Lincity||1999||2013||City-building game||GPL||GPL||2.5D||SimCity clone.|
|Linley's Dungeon Crawl||1997||2005||Roguelike||LGPL||LGPL||?||Roguelike game.|
|Liquid War||1995||2015||Maze games||GPL||GPL||2D||2D game in which you control particles and move them to defeat the opposing side.|
|Maelstrom||1992||2010||Shoot 'em up||GPL||CC-BY||2D|
|MegaGlest||2010||2016||RTS||GPL||CC BY-SA||3D||Cross-platform 3D RTS for up to eight players (can be A.I. controlled) on seven factions. MegaGlest is a fork of Glest.|
|MegaMek||2005||2009||TBТ||GPL||GPL||?||Simulates the Classic BattleTech board game.|
|Micropolis||1989 (as SimCity)
2008 (as Micropolis)
|2008||City-building game||GPLv3||GPLv3||?||Open-source release of SimCity. Also known as OLPC SimCity.|
|Moria||1983||1999||RPG/Roguelike||GPL||GPL||2D||A roguelike RPG based heavily on J. R. R. Tolkien's novel The Lord of the Rings.|
|NetHack||1987||2015||RPG/Roguelike||Nethack GPL||Nethack GPL||Text||A single player dungeon exploration game.|
|Netrek||1988||2011||Shoot 'em up||MIT||MIT||2D||Successor to 1986's Xtrek, Netrek was first played in 1988. It was the third Internet game, the first Internet team game, and as of 2011 is the oldest Internet game still actively played.|
|Nexuiz||2005||2009||FPS||GPL||GPL||3D||Forked into Xonotic following a commercial licensing agreement by a minority of the development team.|
|Oolite||2006||2016||Space Sim||GPLv2||GPLv2||3D||Elite Clone|
|OpenArena||2005||2012||FPS||GPLv2||GPLv2||3D||Quake III Clone|
|OpenCity||2003||2008||City-building game||GPL||GPL||3D||SimCity Clone.|
|OpenClonk||2010||2016||Action, RTS, Platform||ISC||CC BY||2D||Successor of the Clonk shareware series|
|Passage||2007||2007||Side-scroller||Public domain software||Public domain||2D||In 2007 Rohrer released the game's source code and assets into the public domain, while asking for donations (Donationware) and selling the iOS version for $0.99.|
|Pioneer||2006||2016||Space sim||GPLv3||CC BY-SA||3D||Inspired by Frontier: Elite 2|
|PySol||2001||2009||Card games, Patience||GPLv3||Public domain and GPLv3||2D||?|
|Rigs of Rods||2007||2016||Vehicle Sim||GPLv3||GPLv3||3D||Rigs of Rods was initially created as an off-road truck simulator, but has developed into a versatile physics sandbox.|
|Rocks'n'Diamonds||1995||2013||Puzzle||GPLv2||GPLv2||2D||A scrolling tile-based computer puzzle game that can be described as a combined Boulder Dash, Supaplex, Emerald Mine, and Sokoban clone.|
|Ryzom||2004||2016||MMORPG||AGPL||CC BY-SA||3D||All textures and effects, 3D models, animations, characters and clothing (no music or sounds) are under CC BY-SA.|
|Scorched 3D||2001||2012||Artillery game||GPL||GPL||3D||Clone of Scorched Earth (video game)|
|Secret Maryo Chronicles||2003||2009||Platformer||GPLv3||GPLv3||2D||2D platformer inspired by the Super Mario series.|
|Seven Kingdoms||1997||2016||RTS||GPL||GPL||2D||Source code released in 2009.|
|Simutrans||1997||2016||Business Sim||Artistic||Artistic||2D||Similar to Transport Tycoon and its open-source clone, OpenTTD. The player must build a profitable transportation system.|
|Sintel The Game||2012||2012||RPG||GPL||CC BY, GPL||3D||A game based on the Blender Foundation movie, Sintel.|
|Sopwith||1984||2014||Shoot 'em up||GPL||GPL||?||The C and x86 assembly source code to Sopwith was released in 2000, at first under a non-commercial use license, but later under the GNU GPL at the request of fans.|
|Space Station 13||2003||2016||RPG||AGPLv3||CC BY-SA 3.0||2D||A multiplayer, 2D, sprite and tile based role playing game. Written in BYOND.|
|Speed Dreams||2010||2016||Sim racing||GPLv2+||FAL||3D||Forked from TORCS in late 2008.|
|StepMania||2005(?)||2016||Rhythm game||MIT||MIT||2D and 3D||A DDR clone, the player must hit buttons or keys in time with the music.|
|SuperTux||2003||2016||Platformer||GPL||GPL||2D||2D platformer inspired by the Super Mario series.|
|SuperTuxKart||2006||2016||Racing||GPL||GPL||3D||Arcade racing game similar to Mario Kart.|
|Teeworlds||2007||2015||Platformer||zlib||CC BY-SA 3.0 (except font)||2D||2D side-scrolling shooter.|
|Tenés Empanadas Graciela||1996||2007||TBS||GPLv2||GPLv2||?||Based on the boardgame Risk.|
|The Castle Doctrine||2014||2014||MMO||Public domain software||Public domain||2D||A game by Jason Rohrer, developed on a Sourceforge repository and sold on Steam for $14.99.|
|Tremulous||2006||2009||FPS||GPLv2||CC BY-SA 2.5||3D||Alien VS human base building, defending, and attacking opposite team.|
|TripleA||2002||2016||TBS||GPLv2||GPLv2||2D||A turn based strategy game inspired by Axis & Allies and board game engine. Development is ongoing.|
|Tumiki Fighters||2004||2004||Shooter||BSD 2-clause||BSD 2-clause||3D||Written in D and released in 2004 by Kenta Cho under a BSD-like license, like all his games. Later commercially ported to Wii as Blast Works: Build, Trade, Destroy, as well as linux. Included in Debian, ported to Pandora.|
|Tux, of Math Command||2001||2011||Educational game||GPLv3+||GPLv3+||2D||?|
|UFO: Alien Invasion||2006||2016||TBТ||GPLv2+||GPLv2+, CC BY-SA 3.0||3D||Inspired by the XCOM-series, but with 3D-combats on surface of the earth.|
|UltraStar Deluxe||2007||2016||Music||GPLv2+||GPLv2+||2D||SingStar clone.|
|Unknown Horizons||2008||2014||City-building game||GPLv2+||GPLv2+, CC BY-SA 3.0, OFLv1||Isometric 2D||Genre-mix of city-building game and real-time strategy game, inspired by the Anno series.|
|Unvanquished||2012||2016||FPS||BSD 3-clause, GPLv3+||CC BY-SA 2.5||3D||Team-based first person shooter with strong RTS elements, derived from the Tremulous project.|
|Vega Strike||2008||2012||Space Sim||GPLv2+||GPLv2+||3D||Elite clone and space simulator engine.|
|Warmux||2002||2011||Artillery game||GPLv2+||GPLv2+||2D||Worms clone.|
|Warsow||2005||2016||FPS||GPLv2+||CC BY-SA 4.0||3D||A fast-paced arena FPS with movement tricks.|
|Warzone 2100||1999||2016||RTS, RTT||GPLv2+||GPLv2+||3D||Post-apocalyptic, cross-platform RTS.|
|Widelands||2002||2016||RTS||GPLv2+||GPLv2+||?||Widelands is a RTS clone of The Settlers II.|
|WorldForge||1998||2014||MMORPG||GPLv3||GPLv2+||3D||An open-source framework for massively multiplayer online role-playing games.|
|Xconq||1987||2005||TBS||GPLv2+||GPLv2+||?||4X strategy game engine.|
|X-Moto||2005||2014||Platformer||GPLv2+||GPLv2+||2D||Elasto Mania Clone.|
|Xonotic||2010||2015||FPS||GPLv2+||GPLv2+||3D||A fork and direct successor of the game Nexuiz. Binary files for Linux and Windows is under GPLv3+.|
|XPilot||1992||2010||Arcade||GPLv2+||GPLv2+||2D||A multiplayer Asteroids-like game.|
|Yo Frankie!||2008||2009||Action-adventure||GPLv2+, LGPLv2.1||CC BY 3.0||3D||?|
Open-source games with own but non-free content
While the games in this table are developed under an open-source license, the reuse and modification of only the code is permitted. As some of the games' content (sound, graphics, video and other artwork) is proprietary or restricted in use, the whole games are non-free and restricted in reuse (depending on license). The motivation of a developer to keep the own content non-free while he opens the source code is most often the protection of a game as sellable commercial product. Sometimes the motivation is the prevention of a commercialization of free product in future, e.g. when distributed under a CC NC license.
|Title||First release||Last release||Genre||Engine license||Content license||Dimensions||Other information|
|AssaultCube||2006||2010||FPS||zlib||CC BY-NC-SA||3D||Based on Cube. A lightweight online FPS (45-50 MB package), with a built-in map maker and capable of being played with a 56k connection.|
|C-evo||1999||2008||TBТ, 4X||Public domain software||Proprietary||?||Inspired by Sid Meier's Civilization|
|Cart Life||2011||2014||Simulation||Cart Life's Free License (permissive)||Cart Life's Free License (permissive), Freeware||2D||In March 2014 the source code and game was made available by Richard Hofmeier for free online, saying he was finished supporting the game. Winner of the IGF 2013 award.|
|CodeRED: Alien Arena||2004||2011||FPS||GPL||Proprietary||?||Based on ID Software open-source engine.|
|Cube||2002||2005||FPS||zlib||Proprietary||3D||Deathmatch style multiplayer gameplay with map editing.|
|Cube 2: Sauerbraten||2004||2013||FPS||zlib||Various non-free and some free licenses||3D||Deathmatch style multiplayer gameplay with map editing.|
|Frets on Fire||2006||2008||Music||GPL||GPL, Proprietary||3D||Guitar Hero clone.|
|Frogatto & Friends||2010||2011||Platformer||zlib license||Proprietary||?||Initially for Windows, Linux, and Mac; hold and toss enemies, swim, talk; scripting language included.|
|H-Craft Championship||2007||2015||Racing||zlib||Free for personal use||3D||Sci-Fi Racer for Linux, Windows and Android which is using the Irrlicht engine.|
|Katawa Shoujo||2012||2012||Visual Novel||MIT license (most of game and engine beside some scripts)||CC BY-NC-ND||2D||A visual novel.|
|Kroz||1987||2009||Maze||GPL||Freeware||?||Game source released on March 20, 2009.|
|Narcissu||2005||2005||Visual novel||GPL||Freeware/PFSL||2D||Is a free visual novel by the dōjin group stage-nana, telling the story of a terminally ill young man and woman. The english version was made with the ONScripter engine.|
|Lugaru||2005||2010||Action Third Person||GPL||Proprietary||3D||A game where the player is an anthropomorphic rabbit who seeks revenge when a group of enemy rabbits kill their family.|
|OpenRCT2||2014||2016||Business Sim||GPL||Proprietary||2D||OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2|
|OpenTTD||2005||2016||Business Sim||GPLv2||GPLv2, CC Sampling Plus||2D||An open-source clone of 'Transport Tycoon Deluxe'|
|PlaneShift||2001||2016||MMORPG||GPL||Proprietary||3D||Free to play MMORPG.|
|Star Wars Jedi Knight: Jedi Academy||2003||2009||Third-person shooter||GPLv2||Proprietary||3D||Source code was released as GPLv2 by Raven Software and Activision following the dissolution of Lucas Arts in 2013.|
|Steel Storm: Episode I||2010||2010||Action||GPLv2||CC BY-NC-SA 3.0||?||Based on DarkPlaces. An indie top-down arcade shooter with single-player, deathmatch, and co-op.|
|Smokin' Guns||2009||2012||FPS||GPLv2||Proprietary||3D||Western-themed first-person shooter using the ioquake3 engine.|
|Tales of Maj'Eyal||2012||2016||RPG/Roguelike||GPLv3+||GPLv3+, Proprietary||2D||Developed open-source from the beginning with the own T4E engine, while the assets are kept proprietary for commercialization on Steam and gog.com.|
|The Dark Mod||2009||2013||Stealth game||GPLv3+||CC BY-NC-SA||3D||First person stealth game in the style of the Thief (series) games ( 1 and 2 ) using a modified Id Tech 4 engine|
|The Last Eichhof||1993||1993||Shoot-'em-up||"Do whatever your want" license (public domain)||Freeware||2D||Shoot-'em-up game released for DOS in 1993 by Swiss company Alpha Helix. Source code released 1995.|
|TORCS||1997||2016||Racing||GPL||Free Art License, Proprietary||3D||Some car models are non-free, but there is a DFSG-compliant version which doesn't include them.|
|Urban Terror||2000||2011||FPS||GPL||Proprietary||3D||Multiplayer tactical shooter based on the id tech 3 engine.|
|VDrift||2005||2012||Racing||GPLv3+||GPLv3+, Proprietary||3D||Some datas are non-free, for example the "SV" car model, under a CC BY-NC-SA license.|
|World of Padman||2007||2008||FPS||GPL||Proprietary||?||Originally a Quake 3 modification. Became stand-alone in 2007, now runs on ioquake3.|
|Zero-K||2010||2016||RTS||GPLv2+||CC BY-NC-ND 2.0||3D||Zero-K is a multi-platform real time strategy game inspired by Total Annihilation, powered by the Spring game engine.|
Open-source remakes with non-free content from the proprietary original
The video game remakes in this table were developed under an open-source license which allows usually the reuse, modification and commercial redistribution of the code. The required game content (artwork, data etc.) is taken from a proprietary and non-opened commercial game, so that the whole game is non-free. See also the Game engine recreation page.
|Title||First release||Last release||Genre||Engine license||Content license||
|CorsixTH||2009||2016||Business simulation||MIT||Proprietary||2D||Engine remake of Theme Hospital.|
|Exult||1992||2012||RPG||GPLv2+||Proprietary||2D||Engine remake of Ultima VII.|
|Heart of The Alien Redux||2005||2005||Platform game||GPL||Proprietary||2D||Engine remake of Heart of the Alien.|
|OpenMW||2008||2016||RPG||GPLv3+||Proprietary||3D||Engine remake of The Elder Scrolls III: Morrowind.|
|OpenRA||2007||2016||RTS||GPLv3+||Proprietary||2D||Engine remake of Command & Conquer: Red Alert.|
|REminiscence||2005||2011||Platform game||GPL||Proprietary||2D||Engine remake of Flashback (1992 video game).|
Source available games
For video games in this table the source code is available but they are neither open-source software according to the OSI definition nor free software (see software with source available). These games are released under a license with limited rights for the user, for example only the rights to read and modify the game's source for personal or educational purposes but no reuse rights beside the game's original context are granted. Typical licenses are the creative commons "non-commercial" licenses (e.g. CC BY-NC-SA), MAME like licenses or several shared source licenses.
|Title||First release||Last release||Genre||Engine license||Content license||
|Hero Core||2010||2013||Shooter game||?||Freeware||2D||Around 2013 Daniel Remar released the Gamemaker source code of the game, together with the sources of his other games like Iji.|
|Flow||2006||2009||Life simulation||? (educational purposes)||Freeware||2D (layered)||Around 2009 the flash source code was made available for educational purposes by the developers.|
|Fortress Forever||2007||2016||FPS||Proprietary||?||3D||Unofficial, open-source Source engine successor to Team Fortress Classic.|
|I Wanna Be the Guy||2007||2011||Platform game||Shared source like||Freeware||2D||On November 9, 2011 the developer Michael "Kayin" O'Reilly released the source code of the game under a own software license (forbidding new content) so that the game's community would be able to create fixes and patches.|
|Jump 'n Bump||1998||1999||Deathmatch Platformer||Emailware||Emailware||2D||1998 freeware DOS platform video game, written in C and Assembly language by Brainchild Design. The source code was released in 1999, then source ported to several other operating systems and platforms via SDL.|
|Mari0||2012||2012 (stable), 2014 (unstable)||Platformer||CC BY-NC-SA 3.0||CC BY-NC-SA 3.0||2D||Remake of Super Mario Bros with elements from Portal.|
|Notrium||2003||2008||Top-down shooter survival game||custom FOSS license / GPLv3||custom FOSS license / Freeware||2D||Notrium's source code was released by the developer after 2003 under a custom software license and is developed as OpenNotrium on GitHub since then, with new code being GPLv3.|
|Progress Quest||2002||2011||Parody MMORPG||?||Freeware||2D||On May 20, 2011, Eric Fredricksen released the source code of the game on bitbucket.|
|Racer||2003||2011 (proprietary)||Sim racing||Proprietary||Proprietary, Freeware||?||Only source code of 0.5 version is available, all other releases are closed source.|
|Spelunky||2008||2009||Platformer||Non-commercial||Freeware||2D||The source code of the 2008's Windows freeware version was published under a software license permitting noncommercial distribution and modification on December 25, 2009. Based on this source code the game community created a community patch which added support for Mac OS X. For the later remade 2012 release the source code wasn't provided, only for the 2008 "Classic" Spelunky version.|
|Visual Pinball||2000||2016||Pinball simulation editor and game||MAME like license||diverse||3D||Many free custom tables and recreations of original machines available. The program is also able to operate with Visual PinMAME|
Proprietary developed games, later opened under varying licenses
For games which were originally developed proprietary as commercial closed source product, see also Category:Commercial video games with freely available source code.
- List of open-source game engines
- List of commercial video games with later released source code
- List of commercial video games released as freeware
- List of freeware games
- The Linux Game Tome
- "0 A.D. Open Source Release". wildfiregames.com.
- April 1987: Ballerburg - Zwei Spieler, zwei Burgen und ein Berg dazwischen... on eckhardkruse.net "Ich habe das Programm als Public Domain veröffentlicht (die Unterscheidung in Freeware, Shareware usw. gab es damals nicht), mit der Bitte um eine 20 DM Spende. Dafür gab es dann die erweitere Version und den Quellcode." (in German)
- source code on candybox2.net
- Play This Right Now: Candy Box 2 by Nate Ralph on PCworld.com (Oct 24, 2013)
- "Cataclysm: Dark Days Ahead - Dedicated Developer". Kickstarter.
- Jerz, D.G. "Colossal Cave Adventure". Seton Hill University. Retrieved 2007-09-07.
- "Re: CF: the begining(sic) of crossfire". real-time.com.
- Jason Rohrer (2011-10-17). "DiamondTrust/ci/default/tree". SourceForge. Retrieved 2013-05-22.
- "Savannah Git Hosting - freedoom.git/blob - COPYING". Git.savannah.gnu.org. Retrieved 2009-04-04.
- "The KDE Games Open Source Project on Open Hub". ohloh.net.
- "KDE - KDE 1.0 Release Announcement". kde.org.
- "Micropolis Downloads". donhopkins.com.
- Simser, Bil (2008-01-10). "SimCity Source Code Released to the Wild! Let the ports begin...". weblogs.asp.net/bsimser. Retrieved 2012-12-30.
[...]Don Hopkins got a lot of work done on the finishing touches on releasing the original SimCity source code under the GNU General Public Library (GPL). The code won't have reference to any SimCity name as that has all be renamed to Micropolis. Micropolis was the original working title of the game and since EA requires that the GPL open-source version not use the same name as SimCity (to protect their trademark) a little work had to be done to the code.
- "free-moria". Retrieved 2009-04-04.
- supportMyWork on hcsoftware.sourceforge.net "I release all of the source code that I write as free software (free as in "freedom") into the public domain so that others can learn from my work and make use of my source code in their own projects. I also release all of my software in compiled binary form (in other words, "ready-to-run") into the public domain, with no restrictions on use or redistribution." (accessed 2016)
- Passage on itunes.apple.com
- "All releases of PySol – Freecode". freecode.com.
- Clark, Dave (2000-10-29). "Sopwith Code Support". Retrieved 2006-12-01.
- Clark, Dave. "Sopwith – Source Code". Dave Clark's Home Page. Retrieved 2006-12-01.
- "stepmania/stepmania". GitHub.
- CastleDoctrine on sourceforge.net
- Castle Doctrine on store.steampowered.com
- [tremulous] View of /trunk/COPYING
- [abagames.sakura.ne.jp/windows/tf0_2.zip tf0_2.zip] "Copyright 2004 Kenta Cho. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution."
- doujin-classics-the-works-of-kenta-cho on ricedigital.co.uk
- The Indie Shooter Roundtable: Mak, Cho, And Omega Fire At Will by Brandon Sheffield on Gamasutra.com
- TUMIKI fighters on sourceforge.com
- who is Kenta Cho?
-  The sounds are licensed under the CC BY-NC-SA license. Shockbolt's graphics are licensed under a non-free license.
- Petitte, Omri (20 March 2014). "Cart Life exits Steam, goes open source". PC Gamer. Retrieved 21 March 2014.
- cartlife_opensores.zip on the author's dropbox
- "The 17th Annual Independent Games Festival". igf.com.
- "[alienarena] Log of /trunk/docs/license.txt". Svn.icculus.org. Retrieved 2010-07-13.
- Developer Info Source Code and License: [...] Our code is open-source, our content isn’t.
-  "For the most part H-Craft Championship sources are released under the zlib-license."
-  You are not allowed to modify or distribute the media files or use them in your own games. But you can still download the media files and they are free for personal use.
- "Katawa Shoujo Forums • View topic - Please release Katawa Shoujo source code as free software". renai.us.
- narcissu on insani.org
- "Steel Storm Episode I". blendernation.com.
- "STEEL STORM EPISODE 1 LIMITED USER SOFTWARE LICENSE AGREEMENT". steel-storm.com. Retrieved 2013-08-10.
For the purpose of this Agreement, the Art Assets include pk3 archive inside of "steelstorm/gamedata/" folder that contain two-dimensional and three-dimensional works of graphic art, photographs, prints and art reproductions, maps, charts, diagrams, models, and technical drawings, sound effects and musical arrangements, documentation and tutorial videos, and are licensed under Attribution-NonCommercial-ShareAlike 3.0 Unported license. The Engine, which includes Windows, Linux and Mac binaries, and the Engine's source code, are licensed under GNU GPL v2 license.
- COPYING-MEDIA on git.net-core.org/tome "All the medias located in all the "/data/gfx" folders are granted to use with the Tales of Maj'Eyal game only. Please contact email@example.com for more informations." (2016)
- COPYING on git.net-core.org/tome (2016)
- "Tales of May'Eyal on Steam". Steam. Retrieved 26 December 2013.
- "Release: Tales of Maj'Eyal and Ashes of Urh'Rok expansion". GOG. 4 November 2014. Retrieved 5 November 2014.
- beersrc.zip - readme "Do whatever your want" license
- "license.txt". github.com.
- Prophet. (2002-03-28). "GameSpyDaily - Exult Interview". Archived from the original on 2002-04-02. Retrieved 2008-05-29.
- Megidish. (2005-01-12). "Heart of The Alien - Redux". Retrieved 2016-10-15.
- Montoir. (2011-03-11). "REminiscence". Archived from the original on 2015-08-01. Retrieved 2015-08-13.
- resources on remar.se "source code"
- You can get it here. on thatgamecompany.com by Jenova Chen (Sep 21, 2009)
- "Fix My Game: IWBTG Source Code Release". Kayin.pyoko.org. Retrieved 2015-03-26.
- DIYGamer: Recursive Romhackery – I Wanna Be The Guy Source Code Released (2011)
- "IWBTG! - Downloads!". Kayin.pyoko.org. Retrieved 2015-03-26.
- Jump 'n Bump readme.txt JUMP 'N BUMP by Brainchild Design in 1998 Jump 'n Bump is e-mailware. That means you're supposed to send us an e-mail. Write for example where you're from and what you thought about this game. If you do that, you will greatly encourage us to make more games for you!
- copying github.com OpenNotrium
- Source Code ReleasedProgressQuest v6.3
- pq on bitbucket.org
- Spelunky User License v1.1b
- Sarkar, Samit (2012-10-12). "Spelunky unofficially patched with Mac OS X support". polygon.com. Retrieved 2014-08-07.
Spelunky, Mossmouth's renowned roguelike platformer, is now playable on Mac OS X, thanks to an unofficial patch from the game's community.
- "Spelunky v1.3 (and Source) - Now for Mac OS X and Windows". 2012-09-12. Retrieved 2012-10-05.
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