Jim Gandy offers Marathon To Marne, a set of free wargames rules for games from ancient times to the widespread deployment of the machine gun.
rules
Bonaparte Napoleonic Rules
Bonaparte is a set of free wargames rules for Napoleonic warfare. It’s in Portuguese, so your mileage may vary.
Firefly Outgunned WWI Microarmor Rules
Firefly Outgunned is a set of free wargames rules for WWII microarmor. They’re based on the old Firefly and Challenger rules sets.
Minimal Melee Combat
Minimal Melee Combat is a set of free wargames rules designed to depict combat between sword armed adversaries.
A Fistful of Sardaukar Dune Miniatures Game
A Fistful of Sardaukar is a set of free wargames rules for battles in the Dune universe of Frank Herbert.