Sooooo, you didn't want to just buy Counter Strike?
I don't know what this is actually...
EDIT: Just saw some pics of it. But this is different:
1. Quake 3 Arena Based (Engine)
2. ...
And it's
better because:
1. It's free
2. You can make your own maps.
Oh yeah, and it has really good graphics considering the system requirements (did I already say that?)
The most FPS I've ever had was about 90FPS, which is pretty good considering I only have an "average" laptop (1.6GHz 3Gb RAM)