PIRATE BORG is a complete game based on and compatible with the award winning doom art-punk RPG Mörk Borg using their incredible 3rd party license. But it’s also a tool kit. Most of the tables can be hacked and used with any tabletop RPG, and you can add-on the 5e Bestiary Zine* to get 5e stats for all the monsters and NPCs in the book.
Pirate Borg is d20 based. Players roll 3d6 for each core stat, and you use the resulting modifier to try and beat a Difficulty Rating (DR). Most rolls are player facing, meaning players roll to attack and roll to dodge enemies; the gamemaster doesn’t need to roll any dice in melee combat (but will in naval combat).