There are a couple I have in mind. Like many techies, I am a huge fan of RSS for content distribution and XMPP for federated communication.
The really niche one I like is S-expressions as a data format and configuration in place of json, yaml, toml, etc.
I am a big fan of Plaintext formats, although I wish markdown had a few more features like tables.
I was under the impression XEP-0060 solves that.
Sorry, i won’t read that whole thing. But i guess you’re right, in which case i take back what i said.