UrbanTerror - Counter-Strike-Like free shooter. Great tactical realism based game.
World Of Padman - Fast paced, abstract deathmatch game. Bright colors, and mouse sized players make a kitchen a battle ground.
Warsow - Cell shaded, E-Sports, french developed game. Fast paced, and brutal. Some skill required.
OpenArena - Quake 3 recreation on the released engine.
Tremulous - First Person Shooter with and RTS Blend
Hope everyone enjoys. I've been playing these a lot recently on my laptop while I'm upgrading my desktop.