There is more.

- It can be used to point out the real address of a Matrix home server (try https://ingwie.me/.well-known/matrix/client and https://ingwie.me/.well-known/matrix/server respectively).

- It can be used to tell Mastodon information about your instance.

And as for Nostr, zaps (LNBits' LNURLP spec) and NIP-05.

But I wonder if there is anything more...

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I think I've also seen it used for DNS verification and LetsEncrypt