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.
Oh this! YAML was a terrible choice. And that’s coming from someone who likes Python and prefers white spaces over brackets. YAML never clicked for me.
https://noyaml.com/
What you mean you can’t easily tell what this is?
- foo: - - : - bar: baz: [ - - ]