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.
age of sail
Wooden Ships and Iron Men Lite Rules
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
Nelsons Wars: Napoleonic Naval Rules
Andy Watkins offers Nelson’s Wars, a set of rules for miniatures battles in the age of fighting sail. The mechanics are based on the Silent Death rules, which use dice of different sizes (d4, d6, d8, d10 etc.) to distinguish between different weapons systems.
Rules For 16th to 19th Century Naval Wargames
Erik Springelkamp offers a set of free wargames rules for 16th to 19th Century Naval Wargames.
Victory At Sea – General Chase! Age of Sail Rules
David Manley offers Victory At Sea – General Chase! a set of free wargames rules for the Age of Sail.