Zotero

Zotero is a reference manager that does exactly what it promises: collect, organize, cite, and share research. It runs on Mac, Windows, Linux, iOS, and Android, and the browser extension works on most academic databases. I tested it on JSTOR, PubMed, and a few random news sites, and it grabbed full citation details every time. The desktop app lets you sort items into collections, tag them with keywords, and create saved searches that automatically fill as you add new materials. It also integrates with Word, Google Docs, and LibreOffice for inserting citations and generating bibliographies on the fly.

The tool is developed by a nonprofit and the code is open source, which means your data stays yours. There is no tracking, no ads, and no push to upgrade. The free tier includes 300 MB of file storage, which is enough for a few dozen PDFs but not much more. Paid plans start at $2.08 per month for 2 GB, which is reasonable compared to proprietary alternatives like EndNote or Mendeley. The biggest limitation is that syncing across devices requires a bit of manual setup, and the interface, while functional, feels dated compared to some newer tools.

Overall, Zotero is a practical, no-nonsense tool for researchers who want to spend less time formatting citations and more time writing. It is not flashy, but it is reliable and backed by a community that keeps it updated. If you need a free citation manager that works offline and respects your privacy, this is the one to use.