Corvus is a set of free wargames rules for fighting ancient sea battles.
David Heading offers a set of Renaissance Naval Rules.
Schnell Rules is a set of fast play rules for WW2 coastal forces.
Trireme, from Andy Watkins, is a set of free naval wargames rules. These are of the one-page variety, which means that there is much to recommend them. I also like the staggered movement system based on boat speed, which reminds me of the old Car Wars system.
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