Iron Cow is a set of simple rules pitting companies and battalions of science fiction and armor against each other.
Micro Armor Devastation is a set of fast play miniatures rules for land and air combat from World War II onward. They’re very nicely done in a pdf format.
Ty Beard’s Fistfull of Tripods is a set of free wargames rules for fighting battles from H.G. Wells’ War of the Worlds. It is a tactical level game, where one stand is a platoon. I’ts designed for 1/300 (6mm) scale figures.
NOTE: This is an updated URL. The old one was no longer working.
Taking The Bull By The Horns is a set of free wargames rules for Zulu War skirmishes in 1/300 scale.
The Shellshock Combat System is a comprehensive set of free wargames rules for WWII, Modern and Science Fiction combat. Designed for micro scale (1/285), it features three “levels of play”: basic, advanced and “blitzkrieg” (fast play).