'Second brain' program

The idea of 'Notion' really appeals to me but they don't seem to have any care for users privacy. Does anyone know of a program to can do the same thing? Looking to be able to replicate this \[can't post link because the post will be removed, but the video is 'A**DHD & Notion: The Best ADHD Project Management Tool: Helpful Ideas & Templates**' by Jenna Redfield. I've heard of Obisidian, Anytype, but not sure if these can yield what …

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