Blood Frontier: New Free First-Person Shooter Game [Open Source, Cross-Platform]

Blood Frontier is a free and open source single and multi-player first-person shooter game built on a complete remake of Cube Engine 2, which lends itself toward a balanced gameplay, completely at the control of map makers, while maintaining a general theme of tactics and low gravity.

The game uses SDL and OpenGL which allows it to be ported to many platforms, therefore it works on Windows, Linux and Mac OS X.