Tim’s Miniatures Blog has some Age of Sail House Rules for Savage Worlds. He also has some Savage criticism of those who wrote the Pirates of the Savage Main rules.
Scum of the High Seas is Rudi Geudens set of hex-based. card driven rules for playing games of Pirates on the high seas. Like others in this series, they’re based loosely on Richard Borg’s Battle Cry system.
Chronofus has written a set of free miniature wargames rules called Piracy, and also an amazing amount of supplemental and source material on pirate captains, pirate history, pirate flags, nations of the Caribbean, slavery, clothing, weapons, currency, towns and more!
Scuttle! is a print and play game where 1 – 5 players are pirates scheming to collect 21 dubloons.
Pirates anyone? Pieces of Eight is a set of free wargames rules from Andy Watkins portraying Hollywood pirate skirmishes. They are a relatively simple set of rules — but that’s a good thing! Who wants complications when you’re playing pirates.