rules

Large Scale Civil War Battle Rules

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Large Scale Civil War Battles is a set of free wargames rules where one base=1000 men and an inch=100 yards.

Inquisitor Rules 40k Universe

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Inquisitor was game produced by Games Workshop set in the Warhammer 40K Universe. Curiously, it used 54mm figures.

The game is out of print, but a rules archive is at the link.

A Fistful of Honey Cowboy Bear Rules

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Eureka Miniatures offers a one-page set of rules for playing wild west shootouts with its teddy bear cowboy figures.

Star Wars Full Thrust Rules

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Full Thrust is an excellent set of starship combat rules — my personal favorite, in fact. Here are a set of modifications and statistics for playing Star Wars battles.