Old School informed GURPS Dungeon Fantasy gaming. Basically killing owlbears and taking their stuff, but with 3d6.
There close to 20 of them out now. I've read a few....I liked Prince of Wolves and its sequels a lot. Like D&D fiction YMMV on appreciation of gaming fiction, but if you're into it the PF novels are worth a spin.
I quite like the Dave Gross novels. The others I've read are all okay, but I haven't read the last few.