Ask HN: Any good out of the box WYSIWYG and MD JavaScript libs?

I am trying to build an editor for my users to use asap that supports both wysiwyg and md.

I also want to be able to add @ mentions and ability to paste images and stuff right into the editor.

I’m time strapped right now and wondering if someone can recommend one they’ve personally used that supports these basic features out of the box.

Prefer open source but willing to look at a paid one in the short term.