How to you administer your collection of papers/e-books?
What software do you use for managing your library of papers and e-books (mainly PDFs)?
I found Zotero to be a nice way to organize large numbers of papers. But their mobile story was a bit lacking as of a few years ago.
I use Calibre [0] for ebooks, and PDFs are just in a file on the desktop. I supose you could put them into calibre, but reading papers on an eink reader doesn't sound idea.
[0] - https://calibre-ebook.com/
I use a "heap" data structure :-)