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Looking for OneNote Alternative
(feddit.de)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Joplin is great but Obsidian is definitely worth checking out. You can find both as flatpaks.
Big fan of Obsidian. Especially for written notes. If you are working with a lot of images I'd give its canvas feature a try. I'm not using it personally, but I think it might fit the bill.