Savage 2

Savage 2 is a 100% Free online game with Real Time Strategy, First Person Shooter, and Role Playing all built into one. It runs natively on 32 bit and 64 bit Linux and has the best graphics I have found so far in a Linux Native game.

You all should definitely check it out (Make sure you do the quick tutorial)

http://www.savage2.com/en/main.php