Writing
Money, pricing and sourcing. Not heat treat — there are better people than me on that.
Temperline does this arithmetic for you — materials, consumables, overhead and your hours — and tells you what a knife actually made you. It's invite-only while it's in beta. The first 50 makers to log one real knife with its real costs keep it free for life.
The knifemaking supply map is free and needs no account — 26 suppliers across five continents, every address checked against a primary source.