There are many alternatives to Zotero for Mac if you are looking for a replacement. The best Mac Document Manager alternative is Mendeley, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to Zotero and four of them are Document Managers available for Mac so hopefully you can find a suitable replacement. Other interesting Mac Document Manager alternatives to Zotero are Paperpile, UbikReader and PDF Stacks.
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...
Organize your research papers in a Gmail-like web app, sync your PDFs to Google Drive and cite your references in Google Docs.
UbikReader is the new way to organize your documents. Multitask while you read, annotate, write notes and share your documents with ease. No more worrying about how to manage your large, cluttered library of documents.
With PDF Stacks, you can organize, find and browse, search, annonate and share your collection and library of PDF files, papers, research and journal articles with a single click. It saves you time: no more wondering around your computer to find a PDF file.
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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.