Legion Wargames offers Close Files and European Order, a set of free wargames rules for playing wargames in the period 1700 – 1720. They’re based loosely on the classic Loose Files and American Scramble.
Braid and Cockade is a set of free wargames rules for game set in the 1750 – 1850 era.
Scott Mingus offers a Johnny Reb variant for playing the American War of Independence.
Sgt. Perry’s Heroes offers a variant of the Legends of the Old West rules for miniature wargames set in the era of the Three Musketeers.
King George’s Northwest Passage is a set of free wargames rules for skirmishes in the horse and musket period of 1680 – 1815. There are rules for special characters such as Hawkeye, Sharp and Blackbeard.