A Free and Open Source FPS
Available for Windows, Linux/BSD and Mac OSX
Agile gameplay: wall run/kick, impulse dash, and jetpack
Builtin Editor: create your own maps cooperatively online
The game is a single-player and multi-player first-person ego-shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, completely at the control of map makers, while maintaining a general theme of agility in a variety of environments.
Watch the trailer: