The AD Wars is a set of free wargames rules that are adaptation of Warhammer Ancient Battles for science fiction games. It’s interesting. You will need a copy of Warhammer Ancients to play, though. But there are a lot of copies of that out there.
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science fiction
Random Loot Generator For Gamma World
The Random Loot Generator produces a pdf of random objects for your characters to find in Gamma World, or other post-apocalypse games. It also would work nicely with other post-apocalypse games.
FUBAR One Page Modern / Science Fiction Rules
Fubar is a good looking one page set of modern and science fiction rules.
Free 3D Terrain For Dust Tactics
Top Solitario, one of my favorite sites for its quality free paper products, has a selection of 3-D terrain pieces for Dust and other games which can be downloaded, printed and quickly constructed — a bonus is that they also fold flat!
Paper Science Fiction Ornithopter Model
Toposolitario has a new paper model for you to enjoy: a science fiction ornithopter. The artist points out that a 50% printing, it would work for the now very popular 15mm science fiction figures.