Zotero is a great tool for references. I am using it for 10+ years mostly for research papers in LaTeX+bib but also for things like "Read It Later" and notes. I

Zotero is a great tool for references. I am using it for 10+ years mostly for research papers in LaTeX+bib but also for things like "Read It Later" and notes. I find it more straightforward to use than EndNote or Mendeley and Zotero works perfectly fine with my library of about 7K entries. Also it has a useful feature that lets you save your PDFs on a WebDAV server of your choice like pcloud.com or self-hosted.