I've tried and used a lot of note taking apps, including the big ones like evernote and onenote. I have been using cherrytree for a couple of years now and it is terrific:
* good formatted text/content paste from the browser (this is what the other newer contenders mostly fail to do well)
* good formatted text/content paste from the browser (this is what the other newer contenders mostly fail to do well)
* rich formatted text, images, tables
* ability to organize notes in tree structure
* cross-platform
* open source
* open file format
* no account required
* no electron
* active development (albeit slow)