1. A piece of rope (a 'Fraid Not from Tom Drum, actually)
2 Jumpstretch bands...these are actually the tools I use the most when I stretch and do prehab/rehab work now.
3. A strap...functions like the rope, except it's longer. Pulled it off a defunct infant car seat. Ususally works better than the rope.
4. Foam rollers, Big PVC pipe, tennis balls, 1.25"-1.5" diameter superballs for soft tissue work.
I use the pad of my GHR as a "backbender" kind of thing, or the swiss ball.