Minions: Rebirth (I was offline for a while, so I ended up doing my own 3.5 updates and I'm content with them as my own "spin" on Minions).
Follow-up would be Ink & Quill, with some material derived from Norse Gods.
(Is Oathbound in pdf? That would be so... Weird. Regardless, I play in an Oathbound game, and while I don't use the book personally, it's used every session by the GM.)