OpenArena
- An open-source content package for Quake III Arena (free stand-alone game). Contains bots. (GPL) [win32, linux & bsd (x86), macosx (ppc)]
- http://openarena.ws/

Eclipse-game
- Eclipse is a driving and FPS style shooting game with comprehensive campaign. Story takes place on surface of Moon. OpenGL graphics and original soundtrack. Single-player game only.
- http://www.drzizka.adslink.cz/Eclipse.html

AssaultCube
- (formerly ActionCube) It's a Cube mod (total conversion), team oriented multiplayer first person shooter (Counter-strike like and more). The gameplay is similar to ActionQuake and provides a more "realistic" gameplay experience than Cube. (ZLIB
- http://assault.cubers.net/

Cube 2: Sauerbraten
- Singleplayer (2 game modes, savegames) and multiplayer (12 game modes) first person shooter, built as a major redesign of the Cube FPS. Possibility of in-game map editing (even multiplayer). Central server list. Demo recording. Uses OpenGL & SDL. (ZLI
- http://sauerbraten.org/

Cube
- Singleplayer (2 game modes, savegames) and multiplayer (12 game modes) first person shooter. Over 100 maps, possibility of in-game map editing (even multiplayer). Central server list. Demo recording. Uses OpenGL & SDL. (ZLIB license) [win32, linux &am
- http://www.cubeengine.com/