DiceDream (PBtA)
This is a dungeon-crawling game¸ pure and simple. I
t takes influence from a number of other such games¸ and is designed to be compatible with any content with the same six stats¸ levels¸ and Hit Dice as Dungeons & Dragons.
It incorporates Dis/Advantage from 5e D&D¸ 3d6-straight-down stat generation from old-school D&D¸ Aspects and Fate points from Fate¸ trianary task resolution from Apocalypse World¸ and incorporates some of my past work.
The game's mechanics are hyper-focused on dungeons¸ to the point that the mechanics for time-tracking and even for it's equivalent of HP stop applying when in the surface world.
It's meant for the GM to choose a megadungeon¸ and have the PCs spend all or nearly all of their time either in that dungeon or in the closest settlement¸ preparing to go back into that dungeon.
It's great in that context¸ terrible in any other that I can imagine.
All of that is just lifted verbatim from the intro. Go ahead¸ check it out. It's good¸ and it's free¸ though please do tip me.