Matt Fritz offers a simple set of rules for recreating the 450 BC naval battle of Salamis between the Greeks and the Persians. The site even has links to paper models that you can use to play the game.
The indefatigable Jim Wallman has a new set of miniatures rules called “The Pirates of Yendor.” It’s for fantasy naval warfare, with rules for elf and dwarf galleys, corsairs and such. It also has an interesting pre-planned movement system using cards.
It all makes me want to get out my old Games Workshop Man O War figures.
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.
Stephen Lorenz offers a new set of WWII naval wargames rules called Seas of War. The set is professionally done and presented in pdf format. It also includes the data on a huge number of ships of the period.
Coal and The Kaiser is a set of free naval miniatures rules.
Author Leonard Heinz writes:
This is a game of low to moderate complexity portraying tactical naval combat in the period from 1904 through 1918. While it will not yet you play Jutland in a day, it will let you play some fairly large actions reasonably quickly. It uses a scale of 4 minutes to the game turn and 1000 yards to an inch on the playing surface. The rules focus on big ships and big guns: battleships (and particularly the Dreadnought-type battleships that began service in 1905), battlecruisers and armored cruisers.