Cherrytree
An open source alternative to OneNote, note taking app
Screenshots
Hunter's comment
If you are familiar with OneNote, of course, you already understand its usefulness, Cherrytree is an open source alternative from OneNote that can be used to take notes.
Equipped with rich text and syntax highlighting, storing data in the form of single xml and sqlite.
Link
https://www.giuspen.com/cherrytree/
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