Zotero is an open source 2.0 citation management tool to help you collect, organize, cite and search your research sources. It was developed by a team of librarians at the Center for History and New Media at George Mason University. It is an extension of your Firefox web browser so you will need to have Firefox 3.0. If necessary you can download Firefox for free to your desktop or mobile device. Its latest feature, Zotero Anywhere includes a standalone component and plug-ins for Chrome, Safari and Internet Explorer.
Zotero offers many online tutorials for various levels of usage competency.