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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.
I'm not sure what OneNote's feature does, but in Logseq you can make a whiteboard and embed other pages and text boxes.