And once we're talking about OSR/NSR we're outside my expertise as a storygamer but the ethos of "rulings not rules" I think means that we have to at least acknowledge classics like necroticgnome.com/pages/about-... Which is just the well modernized old school DnD done extremely professionally.

and of course johnharper.itch.io/world-of-dun... which is just a tight little OSR dungeon delver using a single PBTA move as a core resolution mechanic.

World of Dungeons by John Harper

Simple, quick, dungeon-crawling action