In my search for the perfect role-playing system for swashbuckling, I gravitate toward those of a more freeform nature (Fudge, Sherpa, Risus, Prince Valiant, etc.), but one of the swashbuckliest systems I've seen in terms of specific rules mechanics is Dungeon Crawl Classics RPG. From the Heroic Deeds of the Warrior class to the way Luck functions for the Thief class, many a swashbuckling subgenre could be adapted with little fuss, and I'm tempted to give it a go myself. I know there is a pirate-themed DCC RPG game in the works by a third party publisher, but there are plenty of other swashbuckling settings to tap...
Perhaps a new project for 2020?