Zotero (pronounced "zoh-TAIR-oh") is a browser add-on that collects, manages, and cites research sources. You can attach PDFs, notes and images to your citations, organize them into collections, and create bibliographies.
It was originally designed for use with Firefox, but beta plugins work with Internet Explorer and Chrome, and both a stand-alone desktop application and a web interface enable you to manage and save citations on any computer.
Jason Puckett's book, Zotero: a Guide for Librarians, Researchers, and Educators, provides a thorough understanding of how Zotero can be used in your research. His Zotero LibGuide gives a comprehensive view of the features of the software and how to use it in your library research. Some highlights include: