A
* Abuse is a side-scrolling action game by Crack dot Com.
* Adventure is the original text adventure game by Crowther and Woods.
* Alien Arena is a free standalone deathmatch game based on id software source code.
* Allegiance is a multiplayer, online-only RTS / SpaceCombat hybrid. It was originally developed by Microsoft Research, who later abandoned the project and released the source code. Allegiance is now maintained and updated by the community.
* Arianne is an open source MMORPG in development and a framework to develop new online games.
* Armagetron Advanced is a multiplayer, 3D Tron lightcycle racing game.
http://armagetronad.net/
* Attal: Lords of Doom is a themable 3D turn based strategy game
B
* Battle for Wesnoth is an open source strategy game with RPG elements resembling the Battle Isle series, but in a fantasy setting with elves, dwarves, orcs and loyalists.
* Blob Wars: Metal Blob Solid - A platform game where Bob the Blob must rescue the Blob MIAs. Many stages, intricate gameplay.
* Boson is an OpenGL real-time strategy game, with the feeling of Command and Conquer or StarCraft.
* Bygfoot is a soccer management game.
* BZFlag is a free multiplayer multiplatform 3D tank battle game.
C
* C-evo is an empire-building game for Windows with a very large time scale.
http://c-evo.org/
* Castle is a modernized clone of Castle Adventure.
http://seed7.sourceforge.net/scrshots/castle.htm
* ClanBomber is a free Bomberman clone.
* Crack Attack! is a free OpenGL game based on Tetris Attack.
* Crimson Fields is a tactical war game in the tradition of Battle Isle.
* Crossfire is an open source MMORPG.
* Cuyo is a free Puyo Puyo clone.
* Cube Is a multiplatform FPS/game engine. Created by Wouter van Oortmerssen and developed globally by users and open source fans.
D
* Dark Oberon is a RTS similar to the Globulation 2 and Warcraft Games but in clay animation design.
* Darwinbots is an ALife simulator that can also be run as a competitive programming platform.
* Dnafight is a programming game with bacterials using the Seed7 programming language.
* Daimonin is a 2d fantasy MMORPG [1]
E
* Enigma, an Oxyd clone where the player has to maneuver a marble around a "landscape" to touch matching pairs of "Oxyd"-stones.
F
* FlightGear, an open-source, multi-platform flight simulator.
* Freeciv is a clone of Civilization II.
* FreeDoom is an open-content version of the Doom data. (The engine is already open-source.)
* Freedroid RPG is an isometric RPG starring Tux the Penguin in a Diablo/Fallout inspired adventure.
* FreeOrion is a multiplayer, turn-based strategy computer game, inspired by the Master of Orion series.
* Freespace Descent: FreeSpace — The Great War is a space simulation computer game series.
* Frets on Fire is a PC & Linux game based on Guitar Hero for the PS2
* Frozen Bubble, a "shoot the bubbles"—game.
G
* GGZ Gaming Zone develops game servers and clients and provides online gaming services
* Glest is a cross-platform customizable RTS game like Warcraft or Command & Conquer.
* GLTron is a light cycle racing game.
* GNU Chess, a mature computer chess program. Xboard (a.k.a. Winboard) is an open source front-end for it.
* GNU Go, a free program that plays the game of Go.
* Gusanos is a clone of Liero, it can be described as a cross between Quake and Worms.
H
* HoverRace is an online multiplayer hovercraft racing game that was once shareware.
K
* Several games are included in KDE; for instance:
o KBounce
o Kolf
o Konquest is a galactic conquest strategy game.
L
* LinCity-NG is a city building game like SimCity
* Liquid War is a realtime competitive game based on directing liquid particles around a complex environment.
M
* MegaZeux is a text based GCS.
* MegaMek is a computer version of the BattleTech miniatures wargame
* Moria is an old open source RPG
N
* NetHack is a popular free RPG.
* Netrek, is a multiplayer hybrid shooter and real time strategy game.
http://www.netrek.org/
* Neverball, is a 3D platform game similar to Super Monkey Ball
* Nexuiz is a multiplayer first person shooter
* Noctis is a space exploration simulator.
O
* OpenArena is a First-person shooter based on the GPLed Quake 3 engine
* Openglad is a port of the DOS Gauntlet-style game Gladiator
* Open Quartz is an open-content first-person shooter using the GPL'd Quake engine
* OpenTTD is an open source port of Transport Tycoon Deluxe.
* Outgun is a free-software multiplayer action game for the PC
* Oolite is a 3-d space trading game, in the Elite tradition
P
* Panic - A rewrite of the Apple Panic game in the Seed7 programming language.
* Pingus - A real-time puzzle game inspired by Lemmings.
* PlaneShift (computer game) - A 3d fantasy MMORPG.
[2]
* Project: Starfighter - A two-dimensional, non-linear space shooter with an intricate plot. Parallel Realities
* Promisance is a browser-based empire management RPG coded in PHP
* PySol is a card based game with many features.
Q
* Quadra is a Tetris variant, adding a number of multiplayer modes and gravity.
R
* Rocks'n'Diamonds is an open-source, cross-platform, arcade game that contains the clones of Boulder Dash, Emerald Mine, Supaplex and Sokoban.
http://www.artsoft.org/rocksndiamonds/
* Rogue is the very first computer RPG
* Runesword is a CRPG based on RPGs such as Dungeons and Dragons.
S
* Scorched 3D, a game based loosely (or actually quite heavily now) on the classic DOS game Scorched Earth. Available for both Microsoft Windows and Unix (Linux, FreeBSD, Mac OS X, Solaris etc.) operating systems.
http://www.scorched3d.co.uk/
* Slash'EM, a branch of Nethack.
* Solarwolf, a 2d action arcade game.
* Sopwith (1984), by BMB Compuscience, source code released to the public by its author.
* Space Invaders OpenGL is an open source (GPL), 2D/3D game based on the old arcade classic in which you must destroy enemy ships by shooting them.
http://spaceinvadersgl.sourceforge.net/
* Spring, A 3D RTS game that currently uses content from the abandonware Total Annihilation or total conversion mods.
* Stendhal is an open source multiplayer online adventure game (MMORPG) using arianne framework.
* StepMania simulates dance games, mainly Dance Dance Revolution.
* Stratagus 2D RTS gaming engine.
* SuperTux classic 2D jump and run game.
T
* TEG (Tenés Empanadas Graciela), an open source Risk-like game.
http://teg.sourceforge.net/
* The Mana World is an MMORPG in development with 2d graphics inspired by the style of console games from the 16 bit generation.
http://themanaworld.org
* Thousand Parsec is a framework for space empire building 4X Turn-based strategy games. The framework can be used to clone games such as Stars! and VGA Planets. The project also hosts a number of playable games using the framework.
* Tile World is a clone of Chip's Challenge made by Brian Raiter.
* TORCS is an opensource, crossplatform racing car simulator.
http://torcs.sourceforge.net/
* Tremulous, a cross-platform First-person shooter with some elements of strategy built in.
* TripleA, an Axis & Allies based game with more maps and customization.
* Tux Racer, a 3D OpenGL racing game starring the Linux mascot.
* Tyrant, a graphical Roguelike Java adventure game.
U
* UFO: Alien Invasion is a 3D, turn-based strategy game that pits humans against aliens.
http://ufo.myexp.de/
* Ultimate Stunts is a cross platform, multiplayer clone of the game Stunts.
* UltraStar is a SingStar clone.
* Ur-Quan Masters is the classic Star Control 2 game, re-released under the GPL license.
V
* Vega Strike is a 3D space shooter/strategy game which combines trading, bounty hunting and exploration. There are also several mods based on the Vega Strike 3D engine.
* Vulture's Eye & Vulture's Claw are graphical versions of two Roguelike games (NetHack and Slash'EM respectively).
W
* Warsow is a 3D fast-paced first person shooter based on the qfusion engine.
* Warzone 2100, A RTS very different from the standard C&C or Starcraft approach. Developed by Pumpkin Studios and released to the free software community in 2004.
* Widelands is a RTS similar to the Settlers II Game.
* WorldForge The WorldForge project is producing an open source framework for massively multiplayer online role-playing games.
X
* XBlast, a multiplayer Bomberman-like game.
http://xblast.sourceforge.net/
* XEvil, a 2D side scroller with an excessive amount of violence.
* X-Moto, a 2D motorbike game with funny physics, similar to Elasto Mania.
* XPilot, a multiplayer asteroids like game, one of the first multiplayer games with good gameplay.
* XPilot-ng, a modern version of xpilot with high frame rate, polygons, and opengl support.
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