I bought a ferrule remover (but I didn't know it at the time) and put out a what is it on a forum. A guy came back and said what it was, that it was made by a company called PASCO, and did I want to sell it? No, I said, I'm sure I'll find a place to use it.
But I did check out the site he mentioned. Come to find out PASCO makes all sorts of plumbing tools, both common and specialty. They seem to have someone(s) who sees a need and comes up with a tool to do the job, and then they manufacture it and sell it.
Figured it'd be a good reference for you guys needing plumbing tools. Open up the "products" tab and then open up the "Tools" catalog.
https://www.pascospecialty.com/products.php