Wooden Ships and Iron Men Lite is a set of free wargames rules The author writes that Wooden Ships and Iron Men Lite are:
A rules set that focuses on fighting small squadron actions in the late 18th and early 19th Century using Pirates of the Spanish Main/Crimson Coast/Revolution (hereafter called PoX) ship models. I hope this variant is almost as simple and as colorful as Battle Cry and Memoir ’44 and captures the spirit of the Age of Fighting Sail
Voyage! is a stand-alone campaign system for games set in the Caribbean during the mid-late 16th century. It is intended for use with the The Perfect Captain’s Spanish Fury game.
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.
Barnacle Bill is a set of free wargames rules for pirate adventures on land and sea.