Zotero is a citation management tool built into your web browser -- Firefox, Safari, or Chrome -- that helps you collect, organize, and share citations. Zotero also helps you create and format bibliographies in a wide variety of citation styles (APA, Chicago, MLA, etc.) for your research projects.
Zotero is freely available for download from www.zotero.org.
Zotero imports data, and in many cases full-text PDFs, from the most popular electronic databases, including EBSCO, JSTOR, Google Scholar, ProQuest, PubMed.