5 links
Gamma Patrol
odahoda.de
Old-style, vertical scrolling space-shooter for Linux. You have to fight your way through lots of enemies using different kinds of weapons. (Open Source)
Hellfighter
dracova.com
A fast action space combat simulation for Windows featuring network play, original music, and 3D graphics.
Tunnel Fighter
tunnel.sourceforge.net
3D space shooter for Linux in which you free the hyperspace tunnels of an alien menace. (Open Source, GPL)