Zotero is a free add-on that helps you collect, manage, cite, and share your research sources. It lives right where you do your work - in your web browser. Designed to be intuitive and unobtrusive (it looks a lot like an iTunes library), Zotero is a powerful and handy tool for any academic.
Zotero works on all three major operating systems: PC, Mac, and Linux.
Zotero Quick Start Guide: The A, B, C's of "Z"
Zotero is a production of the Roy Rosenzweig Center for History and New Media at George Mason University and is funded by the United States Institute of Museum and Library Services, the Andrew W. Mellon Foundation, and the Alfred P. Sloan Foundation.
Download Zotero and associated plug-ins using these links: