What game is this?

[themarker0]

http://www.ubuntu.com/files/masthead/910/tour/ubuntu-910-games.jpg

I've always wondered, what FPS is that?

[_h_]

Open Arena?

[Revolutionary101]

I think it may be Alien Arena.

[richs-lxh]

Beneath a Steel Sky (small) and Alien Arena (big)

http://www.gog.com/en/gamecard/beneath_a_steel_sky (http://allmyapps.com/app/ubuntu-9.10/beneath-a-steel-sky-beneath-a-steel-sky)

http://forsakenweb.com/alienarena/ (with a video)