Warhammer Napoleonics is a set of stat lines and modifications for using the basic Warhammer Rules for the Napoleonic period.
Miniatures Rules
Swordplay Man To Man Skirmish Rules
Two Hour Wargames offers Swordplay, a one-to-one skirmish game with sword, shield and bow.
Samurai Knight Fever
Samurai Knight Fever is a set of free wargames rules for Japan’s Age of Battles: 1550-1615. The author is Tod Kershner, who is the designer of popular and established wargames rules including Warfare in the Age of Reason, Age of Discovery, Age of Napoleon, Pig Wars, A Firebell in the Night and Iroquois Terror.
Kershner is a friend of mine, and I have long enjoyed playing in his games.
War of the Roses Skirmish Rules
Andy Watkins offers a set of free wargames rules for the Wars of the Roses.
TSR’s Warriors of Mars
In 1974, TSR published a set of rules for playing out battles set in Edgar Rice Burrough’s Barsoon.