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[31 users on Ohloh]
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.
[6 users on Ohloh]
AssaultCube, formerly ActionCube, is a free first-person-shooter based on the game Cube. Set in a realistic looking environment, as far as that´s possible with this engine, while gameplay stays fast and arcade. This game is all about team oriented multiplayer fun.
Urban Terror
[2 users on Ohloh]
Urban Terror is a free multiplayer first person shooter. Unlike old versions, Urban Terror no longer requires Quake III Arena. Urban Terror is available for Windows, Linux and Macintosh, the current version is 4.1.

Urban Terror can best be described as: "Where Quake meets reality"; it is realism based to a certain extent (environments/weapons/player models), but also goes by the motto: "fun over realism" (fast gameplay and lots of action). This combination of reality and action results in ...

Project Freedom
[2 users on Ohloh]
Project Freedom is an open source cross platform first person shooter. It is an attempt at a large community project to try and bring a good open source game to the gaming world.
Platinum Arts Sandbox
[0 users on Ohloh]
Platinum Arts sandbox is a derivation form the cube 2 engine, aiming to make it easy for both adults and kids to make their own games and/or worlds.

With all the goodies of the cube 2 engine, WYSIWYG map editing, high efficiency rates, inexpensive algorithms for beautiful effects, and the octree world structure.

The project itself is intended more as a base for further expansion, as of this writing, sandbox ships both incomplete (but alas, functional) FPS (first person shooter) and S...

[0 users on Ohloh]
quake3 as doom3+