Well, I was wondering if anyone here plays tremulous. It is a sci-fi shooter on the comuter. It is not only a first person shooter but it is also kinda of a real time strategy because there are builder who make defences to the teams base. Also you can play as humans who upgrade by buying new armor and weapons with moeny earned from killing the aliens (Other team). The aliens upgrade by getting evolution points from kililng humans and can become bigger and badder aliens. Check it out.
http://www.tremulous.net