1666 is a set of free wargames rules for naval combat in the Anglo Dutch wars. The game is designed for 1/2400 ships on a 2 inch hex grid. Direct download.
Rules: Naval
High Seas Drifter WWII Era Battleship Rules
High Seas Drifter is a set of free wargames rules for playing battleship combats in the World War II era.
Fast Play Trireme Rules
Pastor Mueller offers a set of Fast Play Trireme Rules
Steel Ships and Iron Iron Hearts Pre-Dreadnought Rules
Steel Ships and Iron Hearts is a set of free wargames rules for pre-dreadnought naval combat. The rules set dates to 1982 and was played by the Olympic Wargaming league. Classic stuff.
Empires At Sea Ancient Naval Rules
Empires At Sea is a hex-based naval war game for ancients. The author writes:
This set of naval warfare rules is designed for ancient sea battles from the 5th to 2nd Century BCE.
The goal was to keep play fast, simple and with no more than one page of charts. Play-testing has given us a good deal of fun and enjoyment. I hope that each of you will will enjoy it much as we did. Feedback is always welcome, and we know as with all games, it is not perfect but it should suit most peoples needs.