The Games: Blood and Spectacle is a set of free wargames rules for gladiatorial combat in ancient Rome.
rules
One Man One Gun Rules For Plastic Army Men
One Man One Gun is a set of free wargames rules for plastic army men.
OMOG Musket Rules
OMOG Muskets is a set of free wargames rules for small unit actions in the horse and musket era, 1700 – 1849.
Bladestorm Quick Start Rules
Bladestorm, the classic fantasy wargames rules from Iron Crown Enterprises in the 1990s is back in a second edition. You can get the quickstart rules at the link.
Wild West Exodus Free Core Game Rules
Wild West Exodus is a skirmish game that mashes the 19th century American West with steampunk and horror themes. You can get the free starter rules here.