From Surf Wiki (app.surf) — the open knowledge base

List of open-source video games

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Summary

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This is a list of notable open-source video games. Open-source video games are assembled from and are themselves open-source software, including public domain games with public domain source code. This list also includes games in which the engine is open-source but other data (such as art and music) is under a more restrictive license. This is not an exhaustive directory, and it is not meant to be. Games listed must verify their notability. This should usually be done by at least making a stub article and showing where the game has received extensive coverage.

Games should only appear in the first table if their game engine uses an open-source license (public domain, GPL, CC, BSD, MIT, Artistic etc.). Just having source code available does not suffice; the content must be free as well. Many games have source code available but do not use an open-source license; for instance, the license may prohibit modification, or allow only non-commercial use. Such games should not be included on the first table.

Do not list a game's license as "Other", "?", or blank. If the game uses a standard open-source license, name that license and link to its Wikipedia page; if it was non-trivial to find the license, add a reference to a page showing the license. If the game uses a non-standard open-source license, add a reference to a page showing the full license text. If the game uses a proprietary license, or you don't know what license it uses, but it has source code available and it is notable, you may list it in tables two to four.--

Open engine and free data

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 public domain, GPL, BSD, Creative Commons, zlib, MIT, Artistic License or other (see the comparison of Free and open-source software and the Comparison of free and open-source software licenses).

Title	First release	Latest release	Genre	Engine license	Content license	Dimensions	Other information	Programming language
0 A.D.	2009	2025	RTS	GPL-2.0-or-later	CC BY-SA 3.0	3D	Historical, cross-platform RTS, using an original engine named Pyrogenesis. Game source-code released July 10, 2009.	C++, JavaScript, GLSL
2048	2014	2014	Puzzle	MIT	MIT	2D	A sliding block puzzle game.	Ruby, JavaScript, HTML, CSS
A Dark Room	2013	2023	Online text-based role-playing game	Mozilla Public License	Mozilla Public License	Text	In July 2013 the source code of the game was put on GitHub under MPL 2.0. Became commercially successful after the source code release.	Python, JavaScript, HTML, CSS
Abuse	1996	2011	Run and gun	Public-domain software	Public domain	2D		C, C++, newLISP, CMake, Common Lisp
Argentum Online	1999	2018	MMORPG	GPL-3.0-or-later	GPL-3.0-or-later	2D	First open-source MMORPG developed in Argentina.	Visual Basic, VBA, JavaScript, C++, HTML
Armagetron Advanced	2001	2024	Racing	GPL-2.0-or-later	GPL-2.0-or-later	3D	A multiplayer 3D Tron lightcycle racing game.	C++
AstroMenace	2007	2025	Arcade	GPL-3.0-or-later	GPL-3.0-or-later, CC BY-SA 4.0	3D	A top-scrolling space shooter.	C, C++
Ballerburg	1987	2008 (ports)	Artillery game	Public-domain software	Public domain	2D	Public-domain software on the author's website with source code. Later ported to other systems such as Linux, MacOS, iOS, etc.
The Battle for Wesnoth	2005	2025	TBT	GPL-2.0-or-later	GPL-2.0-or-later, CC BY-SA 4.0	2D	Turn-based tactical strategy game with RPG elements. Includes a single-player campaign and skirmish modes as well as multiplayer.	C++, Lua, Python
Biniax	2005	2012	Puzzle	zlib	zlib	2D
Bos Wars	2004	2013	RTS	GPL-2.0-or-later	GPL-2.0-or-later	Isometric 2D	2D real-time strategy game running on a modified version of the Stratagus engine.
BZFlag	1997	2022	Tank / FPS	LGPL-2.1-only and MPL-2.0	LGPL-2.1-only and MPL-2.0	3D	A first-person shooter 3D tank-based multiplayer online game.
C-Dogs SDL	2002	2025	Run and gun	Public-domain software (engine) / GPL-2.0-or-later (game code)	CC0, CC BY, CC BY-SA	2D	Overhead run-and-gun, with hotseat cooperative and deathmatch play for up to four players.
Cart Life	2011	2017	Simulation	Cart Life's Free License (permissive license)	Cart Life's Free License (permissive license), 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. Mirrored on GitHub.
Cataclysm: Dark Days Ahead	2013	2024	RPG/Roguelike	CC BY-SA 3.0	CC BY-SA 3.0	2D	url=http://www.kickstarter.com/projects/568375735/cataclysm-dark-days-ahead-dedicated-developer/	title=Cataclysm: Dark Days Ahead - Dedicated Developer	work=Kickstarter	date=22 June 2013}}
Chromium B.S.U.	2000	2016	Arcade	Clarified Artistic	MIT	2D	A fast-paced arcade-style top-scrolling space shooter.
Colobot	2001	2021	RTS, educational	GPL-3.0-or-later	GPL-3.0-or-later	3D	Source code of the original game by EPSITEC SA was released in March 2012. Since then, the game is maintained by the community as Colobot: Gold Edition.
Colossal Cave Adventure	1976	1995	Text adventure	Public-domain software	Public domain	Text	The original text adventure game by Crowther and Woods.
Core War	1984	1984	Programming game	Various (public domain, BSD, GPL)	Various	Text	Original created by D. G. Jones and A. K. Dewdney, and continued through the present day by the community.
Crossfire	1992	2019	MMORPG	GPL-2.0-or-later	GPL-2.0-or-later	2D	Crossfire originally started as a Gauntlet clone developed by Frank Tore Johansen at the University of Oslo, Norway.
Danger from the Deep	2003	2010	Submarine simulator	GPL-2.0-or-later	GPL-2.0-or-later	3D	WWII U-boat simulator	C++
DDraceNetwork	2013	2024	Platformer	zlib	CC BY-SA 3.0 (except font)	2D	2D online multiplayer side-scrolling co-op platformer.	C++
Diamond Trust of London	2012	2012	TBS	Public-domain software	Public domain	2D	url=https://sourceforge.net/p/hcsoftware/DiamondTrust/ci/default/tree/	title=DiamondTrust/ci/default/tree	first=Jason	last=Rohrer	website=SourceForge	date=2011-10-17	access-date=2013-05-22	author-link=Jason Rohrer }}
DRL	2013	2016	Roguelike	GPL-2.0-or-later		CC BY-SA 4.0	2.5D	Based on Doom and Doom II.
Duelyst	2016	2023	Collectible card game	CC0	CC0	2D	Built using nodeJS, open source release in 2023.
Dungeon Crawl Stone Soup	2006	2023	Roguelike	GPL-2.0-or-later	CC0	2D	An open-source fork of the 1997 game Linley's Dungeon Crawl.
Endgame: Singularity	2005	2020	Science fiction/AI simulation game	GPL-2.0-or-later	CC BY-SA 3.0	2D	Written in Python by EMH, later continued by the community.
Endless Sky	title=Releases · endless-sky/endless-sky	url=https://github.com/endless-sky/endless-sky/releases	access-date=2023-10-24	website=GitHub	language=en}}	2025	Space trading and combat simulator	GPL-3	Public domain, various CC licenses	2D	Inspired by the Escape Velocity series of games. Continuously updated.	C++
Enigma	2003	2021	Puzzle	GPL-2.0-or-later	GPL-2.0-or-later	2D	Oxyd clone.
Fish Fillets NG	2004	2011	Puzzle	GPL-2.0-or-later	GPL-2.0-or-later	2D	Released commercially as Fish Fillets in 1998. Source released in 2002 under GPL-2.0-or-later.
FlightGear	1997	2025	Flight sim	GPL-2.0-or-later	GPL-2.0-or-later	3D	Microsoft Flight Simulator-inspired clone.
Freeciv	1996	2025	TBS	GPL-2.0-or-later	GPL-2.0-or-later	Isometric 2D	Civilization II clone.
FreeCol	2003	2024	TBS	GPL-2.0-or-later	GPL-2.0-or-later	Isometric 2D	Sid Meier's Colonization clone.
FreeDink	2006	2019	RPG	GPL-3.0-or-later	GPL-3.0-or-later	2D	Dink Smallwood fork with non-free assets replaced with free ones	C++
Friday Night Funkin'	2020	2025	Rhythm	MIT License (engine) / Apache License 2.0 (game)	Apache License 2.0 (may be non-commercial)	2D	A 2D rhythm game, with gameplay reminiscent of Dance Dance Revolution and aesthetics reminiscent of early-to-mid-2000s browser games.	Haxe
Frozen Bubble	2002	2008	Puzzle	GPL-2.0-only	GPL-2.0-only	2D	Puzzle Bobble clone.
Gang Garrison 2	2008	2019	Shooter	Proprietary (engine) / MPLv2 (game code)	MPLv2	2D	A retro "demake" of Team Fortress 2. The project was previously under GPLv3.
Glest	2004	2008	RTS	GPL-3.0-or-later	CC BY-SA 3.0	3D	3D real-time strategy game with two factions, AI, and same-platform networking support. Development ceased in 2008. Two forks exist, named MegaGlest and Glest Advanced Engine.
Globulation 2	2008	2009	RTS	GPL-3.0-or-later	GPL-3.0-or-later	2D	In open beta as of 2019.
GLtron	2003	2016	Racing	GPL-2.0-or-later	GPL-2.0-or-later	3D	Based on the light cycle portion of the film Tron.
GNOME Games	1997	2021	Various	GPL-3.0-or-later	GPL-3.0-or-later		A collection of games accompanying the rest of the GNOME desktop environment.
GNU Chess	1984	2021	TBS	GPL-3.0-or-later	GPL-3.0-or-later	2D	Chess-playing engine developed by the GNU Project.
GNU Go	1999	2009	TBS	GPL-3.0-or-later	GPL-3.0-or-later	2D	Go-playing engine developed by the GNU Project.
Hunt the Wumpus	1973	1981	Survival horror/adventure/puzzle	title=The Best of Creative computing	date=1978	isbn=0-916688-01-1	editor-last=Ahl	editor-first=David H.	location=Morristown, N.J.	oclc=2188876	editor-last2=Green	editor-first2=Burchenal}} GPLv2, MIT)	GPLv2]], MIT)	2D	Hunting a monster called Wumpus while moving through caves.
HyperRogue	2011	2021	Puzzle/Roguelike/Educational	GPL-2.0-or-later	GPL-2.0-or-later	Hyperbolic	Puzzle roguelike in the hyperbolic plane.
kiki the nano bot	2003	2007	Puzzle	Public-domain software	Public domain	3D	Mixture of Sokoban and Kula World.
Lincity	1999	2013	City-building game	GPL-2.0-only	GPL-2.0-only		2.5D	SimCity clone.
Liquid War	1995	2015	Maze games	GPL-3.0-or-later	GPL-3.0-or-later	2D	2D game in which you control particles and move them to defeat the opposing side.
Luanti (formerly Minetest)	2010	2025	Sandbox, survival	zlib (engine) / LGPL-2.1-or-later (game code)	LGPL-2.1-or-later	3D	A voxel engine for building games similar to Infiniminer and Minecraft.	C++, Lua
Lugaru	2005	2017	Action/third-person shooter	GPL-2.0-or-later	CC BY-SA	3D	A game by Wolfire Games where the player is an anthropomorphic rabbit who seeks revenge when a group of enemy rabbits kill their family.
Madness Interactive Reloaded	2024	2025	Shoot 'em up	GPL-3.0-or-later	CC BY 3.0	2D	highly moddable 2D shooter developed by Studio Minus that aims to capture the fast-paced, violent combat of the Madness Combat series from Newgrounds	C#
Maelstrom	1992	2010	Shoot 'em up	GPL-2.0-only	CC BY 3.0	2D
Mari0	2012	2018	Platformer	zlib License (engine) / MIT License (game code)	MIT	2D	Remake of Super Mario Bros. with elements from Portal.
MegaGlest	2010	2016	RTS	GPL-3.0-or-later	CC BY-SA 3.0	3D	Cross-platform 3D real-time strategy game for up to eight players (can be AI-controlled) on seven factions. MegaGlest is a fork of Glest.
Meridian 59	1996	2024	MMORPG	GPL-2.0-only	GPL-2.0-only	2.5D	Free MMORPG where you fight alongside friends, side with powerful factions, and explore diverse environments.	C, C++
Mindustry	2017	2023	RTS,	GPL-3.0	GPL-3.0	3D	The automation tower defense RTS, written in Java.	Java
Moria	1983	1999	RPG/Roguelike	GPL-2.0-only	GPL-2.0-only	2D	Roguelike RPG based heavily on J. R. R. Tolkien's novel The Lord of the Rings.	Pascal, C
NetHack	1987	2023	RPG/Roguelike	NetHack GPL	NetHack GPL	Text	Single-player dungeon exploration game.	C
Netrek	1988	2020	Shoot 'em up	MIT	MIT	2D	A 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 2022 is the oldest Internet game still actively played.
Nexuiz	2005	2009	FPS	GPL-2.0-or-later	GPL-2.0-or-later	3D	Forked into Xonotic.
NoGravity	1997 (?)	2005	Space shooter	GPL-2.0-or-later	GPL-2.0-or-later	3D	Source code of the Wing Commander-inspired game released by realtech VR on February 16, 2005.
One Hour One Life	2018	2023	Survival	Public domain	Public domain	2D	Multiplayer co-op survival game.
Oolite	2006	2020	Space sim	GPL-2.0-or-later	Dual-licensed under GPL-2.0-or-later and CC BY-NC-SA-3.0	3D	Elite clone.	Objective-C
OpenArena	2005	2012	FPS	GPL-2.0-or-later	GPL-2.0-or-later	3D	Quake III clone.
OpenCity	2003	2008	City-building game	GPL-2.0-or-later	GPL-2.0-or-later	3D	SimCity clone.
OpenClonk	2010	2018	Action, platform	ISC	CC BY	2D	Successor of the Clonk shareware series.
OpenTTD	2005	2026	Business sim	GPL-2-0-only	GPL-2-0-only, GPL-2-0-or-later, CC BY-SA 3.0, CDDL 1.1	2D	Open-source clone of Transport Tycoon Deluxe.
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.
Pingus	1998	2011	Puzzle	GPL-3.0-or-later	GPL-3.0-or-later	2D	Lemmings clone.
Pinball Construction Set	1982	1983	Pinball, game creation system	MIT	MIT	2D	First construction set video game, and one of the initial Electronic Arts releases.
Pioneer	2006	2023	Space sim	GPL-3.0-only	CC BY-SA	3D	Inspired by Frontier: Elite 2.
PokerTH	2006	2017	Card	AGPL-3.0-or-later	AGPL-3.0-or-later	2D	Open-source virtual poker game.
Red Eclipse	2011	2019	FPS	zlib license	CC BY-SA	3D	A fork of Cube 2: Sauerbraten, with improved graphics and a style of play that incorporates parkour movement.
Rigs of Rods	2005	2022	Vehicle sim	GPL-3.0-or-later	GPL-3.0-or-later	3D	Rigs of Rods was initially created as an off-road truck simulator, but has developed into a versatile physics sandbox.
ROTA	2022	2025	Puzzle platformer	MIT License (engine) / Public domain (game code)	Public domain	2D	A platformer game where the player rotates the world to solve puzzles.	GDScript
Ryzom	2004	2024	MMORPG	AGPL-3.0-or-later	CC BY-SA 3.0	3D	All textures and effects, 3D models, animations, characters and clothing (no music or sounds) are under CC BY-SA.
Scorched 3D	2001	2014	Artillery game	GPL-2.0-or-later	GPL-2.0-or-later	3D	Clone of Scorched Earth.
SCP - Containment Breach	2012	2018	Survival horror	zlib licence (game engine) / CC BY-SA 3.0 (game code)	CC BY-SA 3.0	3D	Horror game based on the SCP Foundation collaborative writing project.	Blitz3D
Secret Maryo Chronicles	2003	2014	Platformer	GPL-3.0-or-later	GPL-3.0-or-later	2D	2D platformer inspired by the Super Mario series.
Space Station 14	2015	2026	RPG	MIT	CC BY-SA 3.0	2D	Space Station 14 is an open-source remake of Space Station 13, developed as a successor.	C#
The Secret Chronicles of Dr. M.	2017	2020	Platformer	GPL-3.0-or-later	GPL-3.0-or-later	2D	2D platformer inspired by the Super Mario series.
Seven Kingdoms	1997	2017	RTS	GPL-2.0-or-later	GPL-2.0-or-later	2D	Source code released in 2009.
Shattered Pixel Dungeon	2014	2024	Rogue-like game	GPL-3.0-or-later	Java	2D	Rogue-Like game with procedurally generated levels and a storyline.
Simutrans	1997	2025	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.
Soldat	2002	2020	Action	MIT license	CC BY 4.0	2D	On May 26, 2020, the source code of Soldat was released under MIT license on GitHub.
Sopwith	1984	2014	Shoot 'em up	GPL	GPL	2D	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.	x86 assembly, C
Speed Dreams	2010	2023	Sim racing	GPL-2.0-or-later	FAL	3D	Forked from TORCS in late 2008.
StepMania	2001	2018	Rhythm game	MIT	MIT	2D, 3D	A DDR clone, the player must hit buttons or keys in time with the music.
SuperTux	2003	2021	Platformer	GPL-3.0-or-later	Various	2D	2D platformer inspired by the Super Mario series.
SuperTuxKart	2006	2022	Racing	GPL-3.0-or-later	Various	3D	Arcade racing game similar to Mario Kart.
Taisei	2017	2024	Shooter	MIT License	CC BY-SA 4.0 / CC0-1.0	2D	A Manic shooter inspired by the Tōhō series.	C
Teeworlds	2007	2020	Platformer	zlib	CC BY-SA 3.0 (except font)	2D	2D online multiplayer side-scrolling shooter.
Tenés Empanadas Graciela	1996	2021	TBS	GPL-2-0-only	GPL-2-0-only	2D	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 $15.99.
The Powder Toy	2010	2023	Sandbox game	GPL-3.0-only	GPL-3.0-only	2D	Falling-sand game.
Thrive	2013	2025	God game/Life simulation game			3D
Tremulous	2006	2009	FPS	GPLv2	CC BY-SA 2.5	3D	Alien vs. human base-building, defending, and attacking the opposing team.
TripleA	2002	2020	TBS	GPL-3.0-or-later	GPL-3.0-or-later	2D	A turn-based strategy game inspired by the board game Axis & Allies. Development is ongoing.
Tux Racer	2000	2009	Racing	GPL-2.0-or-later	GPL-2.0-or-later	3D	A downhill slalom racing game featuring Tux, the Linux mascot.
Tux, of Math Command	2001	2011	Educational game	GPL-3.0-or-later	GPL-3.0-or-later	2D
UFO: Alien Invasion	2006	2016	TBT	GPL-2.0-or-later	GPL-2.0-or-later, CC BY-SA 3.0	3D	Inspired by the XCOM series but with 3D combat on the surface of the Earth.
UltraStar Deluxe	2007	2020	Music	GPL-2.0-or-later	GPL-2.0-or-later	2D	SingStar clone.
Unknown Horizons	2008	2019	City-building game	GPL-x2.0-or-later	GPL-2.0-or-later, 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	2023	FPS	BSD 3-clause, GPLv3+	CC BY-SA 2.5	3D	Team-based first-person shooter with strong real-time strategy elements, derived from the Tremulous project.
Vega Strike	2008	2022	Space sim	GPL-2.0-or-later	GPL-2.0-or-later	3D	Wing Commander: Privateer clone and space simulator engine.
Veloren	2018	2024	Adventure, RPG	GPL-3.0-or-later	GPL-3.0-or-later	3D, Voxel	Open-world, open-source multiplayer voxel RPG.	Rust
Warzone 2100	1999	2024	RTS, RTT		GPL-2.0-or-later		GPL-2.0-or-later, CC0, other open source	3D	Post-apocalyptic cross-platform real-time strategy game.
Widelands	2002	2025	RTS	GPL-2.0-or-later	GPL-2.0-or-later	2D	Widelands is a real-time strategy clone of The Settlers II.
WorldForge	1998	2014	MMORPG	GPL-3.0-or-later	GPL-2.0-or-later	3D	An open-source framework for massively multiplayer online role-playing games.
Worms?	1983	1983	Software toy	MIT	MIT	2D	An interactive version of Paterson's worms, and one of the initial Electronic Arts releases.
Xconq	1987	2005	TBS	GPL-2.0-or-later	GPL-2.0-or-later		4X strategy game engine.
X-Moto	2005	2023		Platformer	GPL-2.0-or-later	GPL-2.0-or-later	2D	Elasto Mania clone.
Xonotic	2010	2023		FPS	GPL-2.0-or-later	GPL-2.0-or-later	3D	A fork and direct successor of Nexuiz. Binary files for Linux and Windows are under GPLv3+.
XPilot	1992	2010	Arcade	GPL-2.0-or-later	GPL-2.0-or-later	2D	A multiplayer Asteroids-like game.
Yo Frankie!	2008	2009	Action-adventure	GPL-2.0-or-later, LGPLv2.1	CC BY 3.0	3D

Open-source games with non-free data (or not entirely free data)

Only the game engines in this table are developed under an open-source license, which means that the reuse and modification of only the code is permitted. As some of the games' content created by the developers (sound, graphics, video and other artwork) is proprietary or restricted in use, the whole games are non-free and restricted in reuse (depending on the content license). The motivation of developers to keep own game content non-free while they open the source code may be the protection of the game as sellable commercial product. It could also be the prevention of a commercialization of a free product in future, e.g. when distributed under a non-commercial license like CC NC. By replacing the non-free content with free content, these games could also become completely free. In practice, many projects include a mixture of free and non-free own content.

Title	First release	Latest release	Genre	Engine license	Content license	Dimensions	Other information
Angband	1990	2016	Roguelike	GPLv2	GPLv2, Proprietary	Text
AssaultCube	2006	2022	FPS	zlib	Freeware	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	2013	TBT, 4X	Public-domain software	Proprietary	2D	Inspired by Sid Meier's Civilization
Alien Arena	2004	2011	FPS	GPL	Proprietary	3D	Based on ID Software open-source engine.
Celeste 64: Fragments of the Mountain	2024	2024	Platformer	MIT license	Proprietary	3D	An open-source game made for the six anniversary of Celeste.
Illarion	2000	2025	MMORPG	AGPL	Proprietary	3D
Cube	2002	2005	FPS	zlib	Proprietary	3D	Deathmatch style multiplayer gameplay with map editing.
Cube 2: Sauerbraten	2004	2020	FPS	zlib	Various non-free and some free licenses	3D	Deathmatch style multiplayer gameplay with map editing.
Doom	1993	1997	FPS	GPL	Shareware	2.5D	Game engine source code was released on December 23, 1997.
Frets on Fire	2006	2008	Music	GPL	GPL, Proprietary	3D	Guitar Hero clone.
Frogatto & Friends	2010	2013	Platformer	zlib license	Proprietary	2D	Initially for Windows, Linux, and Mac; hold and toss enemies, swim, talk; scripting language included.
Gravity Bone	2008	2009	Platformer	GPLv2	Freeware	3D	Brendon Chung built this game on base of the Quake II engine and released therefore the game's source code in 2008. In 2015 ported to Linux and the OpenPandora handheld.
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.
Hammerfight	2009	2011	physics based combat	zlib	commercial	2D	For the third Humble Indie Bundle 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.
Katawa Shoujo	2012	2012	Visual novel	MIT license (most of game and engine beside some scripts)	CC BY-NC-ND	2D	A visual novel.
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.
OpenFront	2024	2025	RTS	AGPL v3.0 with Additional Attribution Terms	Mostly CC BY-SA 4.0, some Proprietary assets	2D	Online browser based real time strategy game. Started originally as WarFront.io fork in MIT license.
osu!	2007	2023	Rhythm game	MIT license	CC BY-NC 4.0	2D	Open-source clone of several games, including Osu! Tatakae! Ouendan!, Taiko no Tatsujin and beatmania IIDX. On August 28, 2016, an Open-source re-write of the osu! client was announced (code named osu!lazer). It was released under the MIT License on GitHub, assets under CC BY-NC. Aims is to make osu!, written in C# with the .NET Framework, available to more platforms and transparent. The closed-source stable osu client is still used by the majority of the playerbase, however it is feature locked and the developers aim to deprecate it once osu!lazer gains user acceptance.
Overgrowth	2008	2017	Action	Apache License 2.0	Proprietary	3D	Source code released on 2022, April 22.
PlaneShift	2001	2016	MMORPG	GPL	Proprietary	3D	Free to play MMORPG.
Rocks'n'Diamonds	1995	2025	Puzzle	GPL-2.0-or-later	Unclear	2D	A puzzle game that is a clone of Boulder Dash-style games and Sokoban. The Debian distribution excludes this title, as it is unclear whether the stated license extends to the game data.
OpenJK	2003	2020	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	url=http://www.steel-storm.com/ss_license.html	title=STEEL STORM EPISODE 1 LIMITED USER SOFTWARE LICENSE AGREEMENT	quote=the Art Assets [...] are licensed under Attribution-NonCommercial-ShareAlike 3.0 Unported license. The Engine [...] licensed under GNU GPL v2 license.	publisher=steel-storm.com	access-date=2013-08-10}}	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	GPL-3.0-or-later	GPL-3.0-or-later, 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	2023	Stealth game	GPL-3.0-or-later	CC BY-NC-SA	3D	First person stealth game in the style of the Thief games (1 and 2) using a modified Id Tech 4 engine
The Last Eichhof	1993	2014	Shoot-'em-up	"Do whatever your want" license (public domain)	Freeware	2D	Shoot-'em-up game released for DOS in 1993 by Swiss development group Alpha Helix. Source code released in 1995.
The Ur-Quan Masters	2002	2021	Action-adventure	GPL-2.0-or-later	CC BY-NC-SA-2.5	2D	Source port of Star Control II.
The White Chamber	2005	2006 / 2013	Adventure	MIT license (Wintermute Engine) / CC BY-NC-SA (game code)	CC BY-NC-SA / Freeware	2D	The White Chamber and its Wintermute source code have been released under CC BY-NC-SA Creative Commons license. That means anyone is free to share and modify the game as long Studio Trophis is credited, it is not for commercial gain and that the result is made available under a similar license. 2013 the Wintermute engines source code was released under MIT.
TORCS	1997	2016	Racing	GPL	Free Art License, Proprietary	3D	Some car models are non-free, but there is a DFSG-compliant version which does not include them.
Urban Terror	2000	2018	FPS	GPL	Proprietary	3D	Multiplayer tactical shooter based on the id tech 3 engine.
VDrift	2005	2012	Racing		GPL-3.0-or-later		GPL-3.0-or-later, Proprietary	3D	Some data are non-free, for example the "SV" car model, under a CC BY-NC-SA license.
Warsow	2005	2017	FPS	GPL-2.0-or-later	CC BY-SA 4.0, CC BY-ND 4.0	3D	A fast-paced arena FPS with movement tricks.
World of Padman	2007	2008	FPS	GPL	Proprietary		Originally a Quake III modification. Became stand-alone in 2007, now runs on ioquake3.
Zero-K	2010	2023	RTS	GPL-2.0-or-later	various, CC BY-NC-ND 2.0 (sound)	3D	A multi-platform real time strategy game inspired by Total Annihilation, powered by the Spring game engine. Released 2018 on Steam.

Open-source remakes with non-free data from the proprietary original

Main article: Game engine recreation

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	Latest release	Genre	Engine license	Content license	Dimensions	Other information
Arx Libertatis	2012	2022	RPG, Immersive sim	GPL-3.0-or-later	Proprietary, content from Arx Fatalis	3D	Engine remake
Daggerfall Unity	?	2024	RPG	Proprietary (engine) /MIT License (game code)	Proprietary, content from The Elder Scrolls II: Daggerfall.	3D	Engine remake
OpenAge	?	2023	RTS	GPL-3.0-or-later	Proprietary, content from Age of Empires II	2D	Engine remake
OpenMW	2008	2022	RPG	GPL-3.0-or-later	Proprietary / CC BY SA (OpenMW Example Suit)	3D	Engine remake of The Elder Scrolls III: Morrowind.
OpenRA	2009	2023	RTS	GPL-3.0-or-later	Proprietary, content from the freeware releases of the classic games.	2D	Engine remake for the classic games in the Command & Conquer franchise, in particular Red Alert.
OpenRW	2019	2020	Action-adventure	GPL-3.0-or-later	Proprietary, content from Grand Theft Auto III and Grand Theft Auto: Vice City.	3D	Engine remake
OpenRCT2	2014	2025	Simulation	GPL-3.0-or-later	Proprietary, content from Rollercoaster Tycoon 2 and if chosen the expansion packs as well.	2D	Engine remake
OpenXcom	2009	2020	TBТ	GPL-3.0-or-later	Proprietary, content from the X-COM: UFO Defense or Terror from the Deep releases of the classic games, which the user needs to have a copy of.	2D	Engine remake
Julius	2018	2021	City-building	AGPL-3.0-or-later	Proprietary, proprietary content from Caesar III.	2D	Engine remake
VCMI	2022	2024	TBS	GPL-2.0	Proprietary, content from Heroes of Might and Magic III.	2D	Engine remake

Source-available games

Video games in this table are source-available, but are neither open-source software according to the OSI definition nor free software according to the Free Software Foundation. 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	Latest release	Genre	Engine license	Content license	Dimensions	Other information
Alien Swarm	2010	2010	Shooter game	Non-commercial usable and shareable	Freeware	3D	In 2010 Valve released this Source engine based game with source code, which started as a mod.
Bugdom	1999	2003	Platformer	CC BY-NC-SA 4.0	CC BY-NC-SA 4.0	3D	Released under a non-commercial license in 2020.
Hero Core	2010	2013	Shooter game	Non-commercial, attribution required	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)	url=https://web.archive.org/web/20160401045349/http://www.thatgamecompany.com/forum/viewtopic.php?t=993	date=2016-04-01 }} on thatgamecompany.com by Jenova Chen (Sep 21, 2009)
Fortress Forever	2007	2018		FPS	Proprietary		3D	Unofficial, open-source Source engine successor to Team Fortress Classic.
Half-Life	1998	2023	FPS	Proprietary	?	3D	The source codes of the Half-Life video game are available, but the source codes of GoldSrc, the game engine of this video game, are not available.
Half-Life 2	2004	2024	FPS	Proprietary		3D	Available through Source SDK 2004 and later.
I Wanna Be the Guy	2007	2011		Platform game	Proprietary	Freeware	2D	url=http://kayin.pyoko.org/iwbtg/forums/index.php?topic=14467.0	title=Fix My Game: IWBTG Source Code Release	publisher=Kayin.pyoko.org	access-date=2015-03-26}} 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.
Larn	1986	2016	Roguelike	Non-commercial	Freeware	Text
Noctis	2000	2003	Platformer	WTOF Public License	Freeware	3D	Space exploration/flight simulation
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.
Prince of Persia	1989	1989	Cinematic platformer, action-adventure	Proprietary	Proprietary	2D	On April 17, 2012, Jordan Mechner released the Apple II source code of the game on GitHub.
Progress Quest	2002	2011	Parody MMORPG	Proprietary	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.
Space Engineers	2013	2018	Sandbox, simulation	Distribution as mod allowed	Proprietary	3D
Space Station 13	2003	2024	RPG	Proprietary	GNU AGPLv3 / CC BY-NC-SA / Others (depends on server)	2D	Many different servers exist each with a different codebase and different license.
Spelunky	2008	2009	Platformer	Non-commercial	Freeware	2D	url=http://www.polygon.com/2012/10/1/3439382/spelunky-unofficially-patched-with-mac-os-x-support	title=Spelunky unofficially patched with Mac OS X support	first=Samit	last=Sarkar	date=2012-10-12	access-date=2014-08-07	publisher=polygon.com	quote=Spelunky [...] is now playable on Mac OS X, thanks to an unofficial patch from the game's community.}} The source code for the 2012 remake has not been made available.
Team Fortress 2	2007	2025	FPS	Proprietary		3D	Released alongside the Source SDK 2013 source code on February 18, 2025.
Visual Pinball	2000	2019	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.
VVVVVV	2010	2020	Platformer	Attribution required	Proprietary	2D	url = https://www.pcgamer.com/vvvvvv-goes-open-source-for-its-10-year-anniversary/	title = VVVVVV goes open source for its 10 year anniversary	first = Fraser	last = Brown	date = 10 January 2020	access-date = 10 January 2020	work = PC Gamer }}

Proprietary developed games, later released under varying licenses

Main article: List of commercial video games with later released source code

For games that were originally developed proprietary as commercial closed source product, see also :Category:Commercial video games with freely available source code.

References

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[http://www.eckhardkruse.net/atari_st/baller.html April 1987: Ballerburg - Zwei Spieler, zwei Burgen und ein Berg dazwischen...] on eckhardkruse.net ''"Ich habe das Programm als Public Domain veröffentlicht"'' (in German)
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[https://web.archive.org/web/20100216232527/http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=300702040&mt=8 Passage] on itunes.apple.com
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"Warzone2100/warzone2100 - COPYING.NONGPL".
https://raw.githubusercontent.com/angband/angband/master/copying.txt {{Webarchive. link. (2016-03-05 The sounds are licensed under the CC BY-NC-SA license. Shockbolt's graphics are licensed under a non-free license.)
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[https://github.com/ptitSeb/gravitybone-pandora gravitybone-pandora] on [[github.com]]
http://www.irrgheist.com/hcraftsource.htm "For the most part H-Craft Championship sources are released under the zlib-license."
http://www.irrgheist.com/hcraftsource.htm ''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.''
[http://hg.icculus.org/icculus/hge-unix/raw-file/tip/license.txt license.txt] on hg.icculus.org/icculus/hge-unix
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[http://n4g.com/news/884032/diygamer-recursive-romhackery-i-wanna-be-the-guy-source-code-released DIYGamer: Recursive Romhackery – I Wanna Be The Guy Source Code Released] (2011)
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[http://anynowhere.com/bb/posts.php?t=409&p=5 license]
[https://github.com/verhoevenv/OpenNotrium/blob/master/COPYING copying] github.com OpenNotrium
[https://github.com/jmechner/Prince-of-Persia-Apple-II Prince of Persia source code]
[http://progressquest.com/news.php Source Code Released][https://bitbucket.org/grumdrig/pq ProgressQuest v6.3]
[https://bitbucket.org/grumdrig/pq pq] on bitbucket.org
[http://www.spelunkyworld.com/files/COPYING.txt Spelunky User License v1.1b]
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(2012-09-12). "Spelunky v1.3 (and Source) - Now for Mac OS X and Windows".
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