Here’s a link to a set of Dr. Who miniatures rules.
Rules: Science Fiction
Astral Dreams Space Opera Miniatures Game
Astral Dreams is a free miniatures game based on the d20 Open Gaming License system. The game’s background is based on a short story of the same name, which involves a war between humans and robots.
GrimDark Future Rules v. 2.3
The folk at One Page Rules have released a new edition of GrimDark Future, a set of one-page rules (with lots of pages of armies you can also download)
Threshold Cards For Full Thrust
If you play Full Thrust, you know that checking systems for damage can consume a good deal of game time. Seeking to solve this problem, James F Clay has come up with the idea of “Threshold Cards.” It looks like a good solution, and is certainly one that I’m going to try the next time we play Full Thrust.
Spaceball Science Fiction Sports
Spaceball is a set of miniature rules for playng a science fiction sports game. Written by the indefatigable Jim Wallman, it looks like it could be fun.