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Onenote alternatives
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Obsidian is my favourite. It's not FOSS, but it is totally plaintext-based, which is close to just as good.