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 arrived to manage releases in a company, the previous manager named releases as “release04092016”, as USA standard. My first recommendation was to name releases as “releaseyyyymmdd” so “release20160409”. I was asked by another manager why to change that, so I showed her a sorted list of releases “git branches” and asked her, can you tell me there when was the last release? (a very common question) Of course, to find the last release you need to check the whole list because the mmddyyyy order is useless. The answer with yyyymmdd was immediate, just look at the last row.