Naginata is a set of free wargames rules for samurai skirmishes.
Miniatures Rules
WWI and WWII Naval Rules
Steve Burt offers a set of free wargames rules for WWI and WWII Naval combat.
The Last Human RPG
In this unusual free role playing game, you play a simple robot charged with defending the last human being. The Last Human is written by Nathan Russel as a part of the 24 Hour RPG Challenge.
1943 World War II Rules
From War Times Journal, 1943 is a set of free wargames rules for battalion level combat in World War II.
Red Actions! Interventionists
The Perfect Captain’s games are amazing combinations of form and function, with artwork that really matters to the game. They now have an expansion to their earlier Red Actions! Russian Civil War game that deals with the various nationalities that intervened in the strife. There’s also a new campaign.