I learnt about markdown from reddit and got to know more suff like ![img]() after joining Lemmy. Found Markor from a thread here or there.
Recently learnt about some features:

• Snippets/templates and controlling how and where the text entered should be:
  https://github.com/gsantner/markor/discussions/2221
• Creating charts and pie diagrams
  https://github.com/gsantner/markor/blob/master/NEWS.md#user-content-charts--graphs--diagrams-mermaidjs
• Katex for math
  https://github.com/gsantner/markor/blob/master/NEWS.md#user-content-settings

And a cool thing is that it supports rendering .html files(considering how Firefox doesn't show up in the list of apps capable of opening them). Was trying out Javascript bookmarklets and created an html file(with the js code in it) to make edits and try out stuff.

Making this post so that others can know of these features. I had Markor installed for more than a year, before I recently read their news.md and noticed these features.

Do you know of any other features or apps that'd be useful for more people to know of?