This guide is largely copied from Jason Puckett's library guide at Georgia State University Libraries - http://research.library.gsu.edu/zotero.
See what other citation managers can do:
Zotero (pronounced "zoh-TAIR-oh") is an application that collects, manages, and cites research sources. It's easy to use, connects with your web browser to download sources, and best of all it's free.
Zotero allows you to attach PDFs, notes and images to your citations, organize them into collections for different projects, and create bibliographies.
The screencast below gives you a quick walk-through downloading it and what it can do.