Zombie Escape is a Warhammer 40K modification for Imperial Guard versus Zombies
Rules: Science Fiction
PZ8 Science Fiction 6mm Wargames Rules
PZ8 Sci Fi is a set of free wargames rules for using 6mm (microarmor) figures in a science fiction setting.
Pacwar Space Dogfighting Rules
Pacwar is a set of rules for large scale dogfights in “The Universe.”
Forge of War Science Fiction Rules
Forge of War is a set of free science fiction skirmish rules from Craig Cartmell. He writes that they were born of frustration with the Warhammer 40K rules from Games Workshop.
Generic Outlandishly Big Spacefleets (GOBS) Rules
Generic Outlandishly Big Spacefleets (GOBS) is a set of free and easy-to-play rules for huge fleets of starships. The author writes:
G.O.B.S.! is fast-paced and easy to learn. Record-keeping is minimal; in most cases, ships blow up rather than retaining damage. (A two ship game of G.O.B.S.! would be over pretty quickly. This game is about fleets, Sparky! We want explosions all over the place!) The length of playing time is dependent on the size of your fleets, but an hour or two should do it for most cases. Wanna play longer? Build bigger fleets!