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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.
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Obsidian effectively let's you do it through window panes. Literally lay out any content in any fashion. There are trade-offs but the graph view makes up for a good portion I think.
Obsidian supports canvases now, which seems very much like OneNote.