I recommend two upgrades over what the OP recommends. For electronic handwritten math, use ZoomNotes on iPad, which has a quirky aestetic but also a bunch of p

I recommend two upgrades over what the OP recommends. For electronic handwritten math, use ZoomNotes on iPad, which has a quirky aestetic but also a bunch of powerful features and the extremely satisfying eponymous infinite zoom. http://www.zoom-notes.com/ http://www.zoom-notes.com/ For organizing a personal library of academic papers, use Zotero, which has a great interface for sorting the papers, annotating the PDFs, and exporting them as BibTeX. (It would presumably be harder to get the OP's single-click PDF links working, though.) https://www.zotero.org/ https://www.zotero.org/ In particular, the Scite add-on for Zotero can also tell you which other papers have cited the the paper you are reading in a supporting way vs. a disputing ("contrasting") way, which is really cool. https://medium.com/scite/introducing-the-scite-plug-in-for-zotero-61189d66120c https://medium.com/scite/introducing-the-scite-plug-in-for-z...