Naumachiae is a set of rules for ancients naval warfare for 1/12000 miniatures.
Rules: Naval
La Felissima Armada Naval Rules
La Felissima Armada is a set of free wargames rules for naval skirmishes between England and Spain in the Elizabethan Age.
Island Mayhem Pirate Rules
Island Mayhem is a set of rules for playing games in which 25mm – 28mm Pirates are searching for treasure.
Shot and Sail Napoleonic Naval Rules
The prolific Jim Wallman offers a set of free wargames rules for Napoleonic Warfare called Shot and Sail. In addition to the pdf fo the rules, you’ll need the zipped graphics of ship cards.
Fleet of Battle Ancient Galleys Wargames Rules
Fleet of Battle is a set of free wargames rules for playing out battles between fleets of ancient galleys. Think Ben Hur. There also are several pages of free print-and-play galleys for use in lieu of lead miniatures. The rules require a knowledge of the commercial Field of Battle wargames rules.