The best alternative to Zotero is Mendeley, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to Zotero and 11 are so hopefully you can find a suitable replacement. Other interesting alternatives to Zotero are Paperwork, BibSonomy, MyInfo and Citationsy.
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...
MyInfo is a personal information manager for Windows. It will help you capture, organize, edit and share ideas, documents, tasks, and web pages.
Perhaps the world’s best reference tool. Create citations, reference lists and bibliographies.
PaperShip is an iPad, iPhone, and Mac application designed to give you access to your Mendeley / Zotero library on-the-go. You will enjoy annotating your PDFs with highlights, notes, free text, drawings and much more!
Refeus is a software to simplify scientific work. Refeus supports the complete workflow from collecting and managing content and publications to write and publishing documents.
Bibfilex is a free bibliographic manager for GNU/Linux, Windows and OS X. It's useful to create and to manage archives of bibliographical items (books, articles, etc.) with possible attachments of any kind according to Biblatex structure and rules.
Citable is a unified workspace for researchers, combining a LaTeX editor, bibliography manager, and note-taking tools all in one place.
With the SCRiBBR APA Generator you can easily generate citations in the APA reference style. Select the source type, fill in the input fields and generate the reference in APA style.
Your free Webtop document harvester. With OutWit Docs you will find text documents, datasheets, PDF files, presentations from multiple online sources
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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.