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Onenote alternatives
(beehaw.org)
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Logseq has a "whiteboard" feature which is the closest I've seen.
OneNote has been the only tool Ive failed to find a close alternative to, which is a shame because I hate the new simplified versions of OneNote.
I will say though, the linking available on Obsidian and Logseq is fantastic for d&d notes and worth ditching OneNote anyway (for me it was at least).