Tired of Warhammer 40K? Try Slammer a set of free wargames rules by Chris and Alex Nicole. The rules set is not tied to any particular set of science fiction miniatures, and there are army lists for a wide variety of troops — even Zulus! ??? (For those hordes of primitives versus superior technology games).
Rules: Science Fiction
Fearless Science Fiction Arena Combat Game
Fearless is a set of free wargames rules that are:
… intended as a fast-paced science-fiction tabletop game including role-playing elements, with a universe full of unknown possibilities as the setting. It allows you to guide mercenaries from various backgrounds into breath-taking fights in the Arenas of Fearless. Additionally prepared scenarios and the possibility to customize your characters offer even more fun to play the game.
Dr. Who Paper Miniatures
Crow’s Nest has a very nice set of paper Dr. Who Miniatures. I’m going to print them out and make a set for my eight year old Dalek Fan.
Stargrunt 40,000
Stargrunt 40,000 is a system for converting Warhammer 40K army lists into a format usable with Stargrunt.
Blasted Planets Skirmish Rules
Blasted Planets is a set of free wargames rules for science fiction skirmishes.
Blasted Planets Skirmish, is basically a set of house rules a few friends and I use to play games with my Sci-Fi figures. I am not trying to model a “Hard” Sci-Fi environment here. I’m borrowing as much from Horror and Fantasy as I am from Sci-Fi. I mean how serious can you be. When you have, Dog headed, Gator men chasing an Elephant guy around an Omni Field generating White rabbit? There is enough “real” world framework here that basic tactics work (most of the time). But enough of a fantastical element that you really can’t count on the idea that the Fin headed alien with the pin gun is going to nail the cave man with the rock every time.