De Bellis Armatis is a set of free wargames rules for ancient warfare.
Corvus is a set of free wargames rules for fighting ancient sea battles.
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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For a limited time, Warlord Games is offering free digital copies of Black Powder, Hail Caesar and Pike & Shotte