The best free alternative to Zotero is Mendeley. If that doesn't suit you, our users have ranked more than 50 alternatives to Zotero and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Zotero are Qiqqa, JabRef, Paperwork and BibSonomy.
Mendeley helps manage and share academic knowledge: Mendeley Desktop is free academic software (Windows, Mac, Linux) for organizing and sharing research papers and generating bibliographies with 1GB of free online storage to automatically back up and synchronize your library...
Qiqqa is a free research and reference manager. Search for, read and annotate your PDFs. Then review your work, write up and create bibliographies instantly.
Bibliography reference manager. The native file format used by JabRef is BibTeX, the standard LaTeX bibliography format.
Reference management and knowledge organization with integrated task planner. Solution for work groups with data sharing in intranet available.
The Research app is designed to streamline your workflow, offering a minimalist yet powerful platform for collecting, organizing, and analyzing research materials.
Search the largest scientific corpus in the world Discover and study research papers better with SciSpace copilot.
ZoteroBib is a free service to help people quickly create bibliographies without installing any software or creating an account.
ResearchRabbit is a research platform that enables you to discover and visualize relevant literature and scholars, create alerts for awesome newly-published papers, share collections with colleagues and the world, and so much more!.
Solve your documentation problems with a single platform that integrates all document formats, enhances collaboration, and maintains real-time updates.
A new FREE citation generator. Automatically create bibliographies, references, and citations in APA, MLA, Chicago, Harvard, and over 8000 more styles with a totally free and no-ads citation generator.
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Mendeley differs from Zotero like this: 1) It is not open source, but it's still free (as in beer); 2) it has better features for annotating pdf files; 3) It emphasizes connections between academics working in similar areas, which helps in discovery of references. Zotero doesn't do that. However, Zotero is better at extracting meta data from pdf files and has the superior browser plugin.