Cloudships of Mars is a set of free wargames rules based on the excellent Space: 1889 universe. The Cloudships game features ships propelled by steam and sail gliding high above the plains of Mars thanks to the magic of “Liftwood.”
rules
Blood Red Skies WWII Aircraft Rules
Warlord Games has a free version of its Blood Red Skies WWII Aircraft Rules.
French Indochina War rules: Contre Les Viets
Contre Les Viets is a set of free wargames rules for fighting the French Indochina War.
Fusilier Flintlock Era Rules
Fusilier is a set of free wargames rules for the the flintlock era.
The author writes:
The Flintlock Era
Fusilier is a wargames system designed for the period 1700 to 1815.The system is designed to be used with any scale of figures. There is no formal figure scale, the unit sizes being dictated by the base sizes, which in turn are based on the frontages of the prototype units. An infantry battalion might be, for example, ten 25mm figures, twenty 15mm figures or fifty 5 mm figures. The ground scale is 1 mm = 1 metre
Stargrunt 40,000
Stargrunt 40,000 is a system for converting Warhammer 40K army lists into a format usable with Stargrunt.