Free plug-in that allows you to store and organize citations as you find them. Also allows you to "drag and drop" citations to create your bibliography. Create groups, add a wide variety of items, store a snapshot of a website. Offers 20+ styles.
Free reference manager. Automatically generate bibliographies; import and annotate PDFs; collaborate easily, find relevant papers based on what you’re reading, access your papers from anywhere online; iPhone app
SSU students, faculty, and staff have access to EndNote Web! Collect and organize your references with EndNote Web and use the Cite-While-You-Write for Microsoft Word plug-in to have your citations formatted in APA, MLA, or any other styles.