I’m currently looking for a replacement to castbox. Castbox us OK, but I want to learn what else good is out there. Bonus points for one that has movement-sensitive sleep timer the way Smart AudioBook Player has.
UPDATE: Testing out Antennapod. Looks nice, and seems to do what I want it to do. I need to experiment with the auto-download a bit and see if it behaves the way I want it to. If it does, we have a winner.
Probably a little less of what you’re looking for, but the Audiobookshelf player in combination with a self hosted ABS instance works great for me.