AssaultCube is a total conversion of Wouter van Oortmerssen´s
FPS called Cube. AssaultCube encourages players from all
platforms to play by being multi-platform (Available on: Windows,
Linux and Mac OS X), partially open-source and low on system
and networking requirements. It is set in a realistic looking
environment (as best that's possible with this engine) while
gameplay stays fast and arcade. This game is all about team
oriented, multi-player fun.