Archipelago of Gold

Archipelago of Gold is a set of free wargames rules for use with the constructable, collectable Pirates of the Spanish Main ships from WizKids. From the BGG description:

These rules use the Pirates of the Spanish Main and a hex map to allow you to explore wild islands for gold, build large fleets, settlements, cities, forts, and train your crews to become superior gun crews. Get more gold back to your settlement, and you can build more than your opponents.

Letters of Marque and Reprisal Age of Sail Wargames Rules

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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1666 Naval Rules For Anglo Dutch Wars

1666 is a set of free wargames rules for naval combat in the Anglo Dutch wars. The game is designed for 1/2400 ships on a 2 inch hex grid. Direct download.

WWII Naval Rules

Gettysburg Gamers offer a set of free wargames rules for WWII navies.

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High Seas Drifter WWII Era Battleship Rules

High Seas Drifter is a set of free wargames rules for playing battleship combats in the World War II era.