I don't see it in the list or in the comments, so I think TiddlyWiki should be mentioned. While not strictly a note-taking app (or even an app, by some definitions) it has some peculiar features, it is free and very upgrade-friendly, and can work without remote services for total privacy.
By the way, I'm planning to use Notion to organize a university course I'll be teaching next fall: its feature set is very interesting for educational use.
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I don't see it in the list or in the comments, so I think TiddlyWiki should be mentioned. While not strictly a note-taking app (or even an app, by some definitions) it has some peculiar features, it is free and very upgrade-friendly, and can work without remote services for total privacy.
By the way, I'm planning to use Notion to organize a university course I'll be teaching next fall: its feature set is very interesting for educational use.