Switched from OneNote to Joplin. It's been a good replacement for organizing notes & code snippets. A couple quirks. Had to write custom CSS in the config to get markdown previews scaled correctly. Formatting has been a nuisance, having to [shift]+enter to not have double lines in preview mode, which seems to break basic formatting around it on reload. Otherwise no complaints, it's free, encrypted, lots of plugins, a great client, and has built in support to sync directly to OneDrive. Better than the janky, slow to load web client of OneNote on Linux!