KeepNote is a free note-organiser based on an outline format that has just gone into Mind-mapping.Org. It is open source software and runs on Windows, Mac and Linux.
There are extensions/plugins supporting importing a folder tree, importing from other types of software, running Python inside KeepNote, and others. It may be plain looking but its cross platform nature, and extensibility – both with plugins and because of the availability of source code – will attract users.
Vic
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