One of the best projects I made in the nwc space was my nwc tester:

GitHub

GitHub - supertestnet/nwc_tester: A tool for testing nwc strings and identifying what they are and, more importantly, what they can do

A tool for testing nwc strings and identifying what they are and, more importantly, what they can do - supertestnet/nwc_tester

It lets nwc devs test their apps for compatibility with various nwc specs. I think it would be very cool to have a similar app for testing compatibility with various cashu nut specs:

Cashu NUTs Specifications