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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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I would suggest Logseq. It's excellent and a step up from One Note IMHO.
I'm using it both for notes at work (software development) as well as a separate graph for my own thoughts, ideas, todos, pretty much everything. Using Syncthing to sync my graphs between devices works pretty well, though it's had a bit of a learning curve in getting it set up.