Reasonable Brom is a variant of Larry Brom’s standard rules for the 19th Century.
rules
Republique Napoleonic Rules
The War Times Journal offers a set of free Napoleonics miniatures rules called Republique.
The War Times Journal also offers orders of battle for Jena-Auerstadt, Waterloo, Busaco, Wagram and Dresden.
Legends of the Rising Sun
Legends of the Rising Sun is a collection of special rules and unit lists for using Legends of the Old West/Lord of the Rings rules for samurai. From Wargames Illustrated 278. Direct PDF download of Legends of the Rising Sun.
One Page Fleets Starship Combat
One Page Fleet is Mike Wikan’s set of free wargames rules for starship combat.