Personally, I use Zotero. For one, I prefer to keep things on my own system rather than use a server. I have 5G of papers in my Zotero archive, which is above t

Personally, I use Zotero. For one, I prefer to keep things on my own system rather than use a server. I have 5G of papers in my Zotero archive, which is above the 2G no-cost limit of Mendeley. It's also handy to be able to pull up a paper even when I don't have internet access, which is surprisingly common if you, like me, visit foreign libraries and archives. For another, Elsevier bought Mendeley in 2013, and Elsevier, well, see https://en.wikipedia.org/wiki/Elsevier#Criticism_and_controversies https://en.wikipedia.org/wiki/Elsevier#Criticism_and_controv... or https://hn.algolia.com/?query=Elsevier&sort=byPopularity&prefix&page=0&dateRange=all&type=story https://hn.algolia.com/?query=Elsevier&sort=byPopularity&pre... . Some of the HN posts in the last 7 months include "Elsevier Complaint Shuts Down Sci-Hub Domain Name", "Dutch universities plan Elsevier boycott", "Elsevier Says Content-Mining Research Papers 'Could Be Considered' Stealing", and "Editorial members of linguistics journal resign to protest Elsevier pricing".