org-noter was just updated on MELPA. It's a package for Emacs that helps you take notes and synchronizes them with the original document as you read through it.
Documentation, installation instructions https://github.com/org-noter/org-noter0:00 introduction
0:30 why use org-noter
0:50 starting an org-noter session
1:15 making highlights
1:50 taking notes without highlights
2:39 navigating between the notes and the document
3:02 2 column mode in PDF
4:20 update on org-noter development/maintenance
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