Urban Terror

It's a stand-alone game based off of the Quake engine, completely multiplayer online and for Linux users too! It's great fun, although like an online FPS can be frustrating at times... You can kick jump off of walls and there are all sorts of weapons to use... http://www.urbanterror.net/

By the way... Raffitz, were you the guy p4wning me with the SR-8 one-hit KO sniper rifle? Cause someone's using your name if not, and they're eating me alive XD