Coastal Command is a set of free wargames rules for small coastal craft in World War II.
Tim’s Miniatures Blog has some Age of Sail House Rules for Savage Worlds. He also has some Savage criticism of those who wrote the Pirates of the Savage Main rules.
I have a large collection of 1/1200 Civil War Ironclads but have never played many games with them becuase I haven’t really found a set of rules I liked. I may give theis free set called Smoke on the Water a try.