Zotero - A free, open source research management tool for the Firefox web browser. This versatile tool allows you to manage every aspect of the research process. Zotero was built by and for researchers at the Center for History and New Media at George Mason University. Check out the video introduction to Zotero on their website.
Citation Management - A research guide devoted to bibliographic management tools that allow you to automatically store and format the bibliographic citations that you find in online library catalogs and research databases. Mendeley and Zotero are free!