Planetary Defense 

Planetary Defense is a space strategy game where you take charge of a planets defenses against waves of attacking aliens. Defend against missiles, multiple warhead rockets, cloaked starships, meteors, homing missiles and laser-armed satellites.
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SOLAR WARS 

SOLAR WARS is a turn-based space strategy game, based in a distant solar system, with up to thirty orbiting planets. Play in single player mode, with computer opponents, or multiplayer mode, over the Internet.
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Starships Unlimited 

Starting with one starship, explore the galaxy, uncover ancient alien artifacts and fight pirates as you expand your empire. No two games are ever the same. "Best Independent Game of 2001" - Computer Games Magazine
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