Yet another multiplayer
FPS based off of the Quake 2 / Quake 3 GPL'ed source code. Alien Arena 2007 has many graphical effects and features include AI bots, alternate fire modes for weapons, a grappling hook, a built-in server browser, game mutators like vampire and regen, and multiple game types including
CTF and Deathball. The game has a sort of 50's era sci-fi look, but it plays just like every other Quake based shooter out there.