Whizbang Dustyboots
Gnometown Hero
Yeah, there's a two page print-out that comes with the Pirate Borg PDFs and those two pages (really four columns across a single landscape print-out) manage to squeeze in an entire column on how to run naval combat. It's a very slim system.I have run Mörk Borg a lot and really enjoy it. The mechanics are all player facing and fit on two A5 pages.
The only thing it really lacks, compared to standard D20, IMO, is meaningful character advancement/creation rules, but you're going to be losing one or more characters in every adventure, so spending an hour building one from scratch would be a terrible waste of time. Much better to quickly generate one, either manually or with the random generation pages that seem to exist for most or all Mork Borg games.