Zotero.org - A researcher's best friend!

Zotero [zoh‐TAIR‐oh] is a free, easy‐to‐use Firefox extension to help you collect, manage, and cite your research sources. It lives right where you do your work — in the web browser itself. 

Students are always blown away when they learn that it will do your bibliography for you. It’s also a great way to keep all your research sources (websites, books, journal articles, etc.) in the same place.