Ain
Space shooter for Windows that has AI for six ships. [Open Source, GPL]
Alienwave
Linux console shoot'em up where you control a space ship and must kill as more alien spaceships as you can.
Evolight
Space fighter for Linux and Windows written in C with Allegro. (Open Source, GPL)
Gamma Patrol
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
A fast action space combat simulation for Windows featuring network play, original music, and 3D graphics.
Hornado
Describes space-shooter for Windows similar to Katakis, with graphics, sounds, and 8 levels of enemies and bosses.
Maelstrom
You pilot your ship through the dreaded "Maelstrom" asteroid belt, the deadliest stretch of space. Available on Linux, Windows, BeOS, or Mac. (Open Source)
Saucer Attack
Download of space shooter for Windows, in which players fly a red rocket-ship against waves of flying saucers.
Star Trek : Avoidance
Star Trek themed game for Windows. Requires Game Maker.
Star Trek Red Alert
Downloads and reviews of several Star Trek themed games.
Supreme
One to two player action/strategy space combat game for Windows.
TimeWarp
A science fiction war and exploration game for Linux based on the Star Control Universe.
Tunnel Fighter
3D space shooter for Linux in which you free the hyperspace tunnels of an alien menace. (Open Source, GPL)