Silent Dark (direct download link) is a set of free wargames rules for “tactical” science fiction games.
Rules: Science Fiction
Titan Rampant – SciFi Dragon Rampant Variant
Titan Rampant is a free variant for the commercial Dragon Rampant rules. Ownership or access to Dragon Rampant is required for play.
Free Project Z Rules From Warlord
Warlord Games is offering a free pdf of their Project Z zombie miniatures rules.
Beyond The Gates of Antares Quick Start Rules
Warlord Games offers a set of free quick start rules for their science fiction small unit game, Beyond the Gates of Antares.
Black Skies Starfighter Combat Rules
Black Skies is a set of free wargames rules for star fighter combat. The author writes:
A while back I was looking for something new to play and decided I’d like to try a star fighter combat game. I checked out a variety of rule sets and found nothing that I really liked. In fact, the most popular set seemed to be unnecessarily complex and slow, not something I expected from a set of star fighter rules. What I expected fighter combat to be was FAST. Complex and slow just didn’t work. So I set out to create my own (with plenty of help from the guys at my local war gaming club). I tried and liked an unfinished set by Shaun Austin which had several good ideas, but I thought the turn sequence could be streamlined. Using the basic card movement idea, and a simple combat system I tried to make these rules feel more like the fast deadly action I imagine star fighter combat should be.