Letters of Marque and Reprisal is a set of free wargames rules for replaying battles in the age of fighting sail. It’s meant for battles where each player would control one ship, rather than a squadron or fleet. It looks perfect for pirate battles.
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Last Hussar’s World War II Rules
The Last Hussar blog has a set of free wargames rules for World War II. They’re a work in progress, so you’ll want to stop back by on a regular basis.
Reasonable Brom
Reasonable Brom is a variant of Larry Brom’s standard rules for the 19th Century.
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.