War of Princes is a simple, one-page set of rules for the American Revolution.
Miniatures Rules
Death To The Alien Scum
Death to the Alien Scum is a set of free wargames rules for 6mm miniatures.
Kensei Samurai Rules
Kensi is a set of free wargames rules for samurai warfare ranging from skirmishes to large battles. The rules include a fantasy element, and the world is a not-quite-historical Japan.
Valley Of The Apes Miniatures Adventure Game
Valley of the Apes is designed as an adventure game for kids. Players create their own jungle terrain, scatter the encounter tiles (with hazards or treasures) across the valley, and send bands of toy soldier figures to seek fame and riches.
High Crusade Science Fiction Rules
High Crusade are a set of free wargames rules for 15mm / 25mm science fiction games.