Sauerbraten

Cube 2: Sauerbraten (or usually called Sauerbraten) is a FOSS & First Person Shooting game, created with Cube Engine. The newest version is Justice (2010).

TRAILER The trailer on YouTube.

LICENSE This game uses ZLIB License. It's a simple license. Just make sure you're telling the truth.

HISTORY The first version is Cube (cubeengine.com), it contains 100 (or more?) maps, but compatible with old version of graphic cards. This version is revision, with quality fixed from older version, and new maps (but amount of maps reduced maybe), engine, and also environment. You'll like it.