Assault Cube

A free multiplayer first-person shooter game that conjures up the classics.

Based on the CUBE engine, AssaultCube features all the elements of your favorite FPS games of the past while actually being free and open source. AssaultCube takes place in realistic environments, with fast, arcade gameplay, and contains 12 multiplayer game modes, including: Deathmatch, Survivor, Capture the Flag, Hunt the Flag, Keep the Flag, Pistol Frenzy, Last Swiss Standing & One-Shot One-Kill (plus team versions of these modes). Beat your own scores, record your game for demo purposes, or break into team action!