Natholeon’s Empires has a set of free wargames rules for the Crimean War.
Rules: 19th Century
French Foreign Legion At Camerone Rules
The Wooden Hand of Captain Danjou – The French Foreign Legion at Camerone is a set of free wargames rules for refighting the “romantic” stand of the French Foreign Legion at Camerone during the Maximilian Adventure of 1861 – 1867.
Reasonable Brom
Reasonable Brom is a variant of Larry Brom’s standard rules for the 19th Century.
Edwardian Splendor Wargames Rules
Edwardian Splendor is a set of free wargames rules for playing 54mm figures in the period 1880 – 1910.
Wild West Skirmish Rules
Steve Burt offers a set of free wargames rules for Wild West Skirmishes.