Alien Trap Nexuiz v2.0

Nexuiz, an open-source multi-platform game designed for
classic death-match game-play, has come yesterday with Nexuiz version
2.0. Nexuiz v2.0 comes just days after its one year anniversary of their
inaugural v1.0 release. While this isn’t like some free and open-source
games that have poor graphics, Nexuiz 2.0 is surprisingly good, and even
supports High Dynamic Range! Nexuiz 2 brings several competitive
features to the table such as a single-player campaign mode, new
particle effects system, and more. We at Phoronix have taken a quick
look at this latest update.

I have to admit, this game is looking good. Going to download it and give it a try.