I’ve built a client and server library and command-line tool (combination of a bunch of code I found and fixed up): https://git.mills.io/prologic/webfinger

I’ve also implemented an experimental feature called WebFinger (webfinger) in d940da9f05 which I’m hoping will “just work”™ 🤞 (at least to provide webfinger lookups) – client-side lookups and discover can come later.