8. Dust 514
Dust 514 is a spinoff of CCP's highly successful EVE Online, with players taking on the roles of boots on the ground in the vibrant online universe. As a massively multiplayer first person shooter, you'll be tasked as one of the countless soldiers dispatched by your spacebound counterparts to take over planets and military installations with the support of spacecraft from EVE Online.
As of this writeup, the game is currently in open beta on the PS3.