Death On The Seas Ancient Naval Rules

Death on the Seas is a set of free wargames rules for ancient naval warfare. Also, Death On The Seas ship appendix.

Bombs Away Carrier Game

Bombs Away is a simple, three page print-and-play game about carriers in the Pacific.

Naval Action

Naval Action, by Lou Coatney, is a set of free wargames rules for miniatures battles in the World War II Pacific Theatre. The page also provides some markers to use in place of model ships.

Battlefleet 1900 Pre-Dreadnought Naval Warfare: 1890-1905

The War Times Journal has a set of free Pre-Dreadnought Naval Warfare rules, designed for 1/3000 scale miniatures.

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.