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.
Rules: Naval
Grand Fleets demo rules
Majestic 12 games has these demo rules for their Grand Fleets miniature wargame. My group has played these and really enjoys them. Majestic 12 explains:
Grand Fleets is a comprehensive miniatures game of dreadnought-era naval warfare. In addition to rules for everything from ships to aeroplanes, Zeppelins to submarines, the rulebook includes:
Data cards for over 120 ships, plus guidelines for converting any ship of the period to game values; Eight scenarios encompassing conflicts from the Sino-Japanese War of 1894 through the opening salvoes of World War Two, including several variants; Fifteen pages of weapon data, covering all major gun and torpedo models in use through 1939, over 200 aeroplanes, and more than 20 airships; and Optional rules for flotillas, night-fighting, smokescreens, and more!
Red Banner Modern Naval Rules
Red Banner is a set of free wargames rules for modern naval combat.
Corvus Ancient Naval Rules
Corvus is a set of free wargames rules for fighting ancient sea battles.
Renaissance Naval Rules
David Heading offers a set of Renaissance Naval Rules.