Things I wouldn't want to make bows without on a regular basis...
Chainsaw, sledge and wedges, drawknife, shellac, Nicholson #49 rasp, farrier's rasp, cabinet scraper straight and gooseneck, heat gun, bandsaw, drying box, 4" ratail for string grooves, air compressor and paint gun, and my tillering tree(rope and pulley setup).
I have a bow horse but haven't used it in years since I have a bench vice and prefer it. I don't use a notched tillering stick at all since I start em off right on the tree from the get-go.
Honestly, I trust and rely on my tillering tree to help closely balance their limbs relative to my holds such that I hope I never have to make a bow without it.