Powered by the Apocalypse has a number of cool settings like Monster of the Week and Spirit of '77. It's most famous for Apocalypse World and Dungeon World where the world is build procedurally. If your thief in Dungeon World rolls to find secret doors and succeeds, then there are secret doors, even if there weren't any there before.
I am trying to get a group started for Kult: Divinity Lost - which is technically a modified PbtA game. (It is based on a traditional 90ies Horror game, but takes the "GM never rolls"-approach, but still affording them more power to tell the story than apparently usual in PbtA.)
I have been playing Shadowrun, Dark Eye since the late 90ies, and after playing Vampire, Battletech, Traveler and sadly A LOT of DnD / Pathfinder i was in the mood for something different and also darker. Bought myself Kult and Call of Cthulhu 7th. Ed.
The setting of Kult seems pretty cool (I am just a bit disappointed with the background info on the "source and true nature of humanity" - it just isn't weird enough for my taste. But the "hopelessness" and chronic evilness of the universe with just these tiny glitter of hope and empathy throughout have a nice atmosphere for gaming.
As an explanation of the setting: All of our history and everything you see, measure and experience is an illusion to placate humanity at large. Humans are godlike, immortal monsters and were tricked/imprisoned by an intricate system of beliefs, customs and mundanity. Humans are re-incarated and "recycled" all over, either by being alone and forgetting everything they experienced or by being tortured to and beyond insanity. (Something like heaven and hell respectively) This cycle keeps the "Illusion"-Machine running - but the Demiurge (Overgod and designer of this prison) has been missing a while now. Some Archons, something like "Principals" of the illusion (Community, Safety, Conformity, Law etc.), went rogue or died. Everything is a mess and old gods, Death-Angels, weird outer-dimension creatures stuck in prison with us, or we with them, clinging to existence through us or trying to exact revenge on us are either trying to either make this prison work, break us out, use our souls and power for themselves or cower in fear expecting humanity to break free any time now.
And through all the questions of morality, and who or what is the worse evil and such. Pretty bleak stuff. But for the players: They are just normal (if often troubled, "dissenting" or weird) modern dudes and dudettes who experience more and more weird shit up to cosmic horror.
I'll see how it runs technically and if i am able to craft a nice campaign.