David Heading offers a set of Renaissance Naval Rules.
Miniatures Rules
Dusty Trails Gunfight Game
Dusty Trails is a set of free rules for wild west gunfights.
WWII Simples Miniatures Rules
WWII Simples is a one-page set of free wargames rules for WWII Skirmish games.
Generic Space Combat 2
Generic Space Combat 2 is a set of free wargames rules which allow players to design their own ships.
Mobile Suit At War
Mobile Suit At War is a set of free wargame rules intended for use with Bandai’s Mobile Suit In Action figures.