Shawn Tomkin’s Ironsworn series. Delve I regularly use for setting up point crawls. Ironsworn/Starforged/Sundered Isles have great collections of random tables, I use the book thematically most fitting for the situation at hand. The core tables of Action, Theme, Descriptor and Focus all get heavy use.
Kevin Crawford’s [SOMETHING] Without Number series have awesome tables as well. These however get more use when I need more detail. Prep stuff. Again most thematic book is picked first but I do have used Cites (cyberpunk) for fantasy cities.
When I want to create background for “medieval fantasy” characters I pick up Burning Wheel and burn something up. Through that I get a good selection of relevant skills to sue (for flavor)
Anything related to cosmos and mythology I say HELLO! to my growing collection of Glorantha material. From cult books to magic tomes and Atlases.
“New to me” it may technically be but I’m going to start up something with Ironsworn: Starforged: Sundered Isles (yes I’m calling it that, fight me). Have used both Ironsworn and Starforged before but not Sundered Isles.
What actually would be new to me is Fey Borg as I’ve yet to run anything Borg. Barely anything OSR at all.