EP Diagram is available for Mac now, as well as iPad and iPhone. If you purchased the iPad version you can download the Mac version for free (and vice versa).
@MushtaqBilalPhD I haven’t tried it. I have used Emacs for years and so I use Emacs packages that integrate with it.
I have used Zotero to organize references, and org-roam for note taking. I have started annotating in Zotero thanks to your posts.
@MushtaqBilalPhD It’s a note taking system that’s an extension of the Emacs text editor. It uses backlinks so that related content can be easily found. It is an implementation of the Zettelkasten system. https://t.co/pXIYQpVspF .