What Zotero Does
Zotero collects, manages, and cites research sources. It's easy to use, can connect to your web browser where you do your work, and 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 using Word or Google Docs.
It automatically updates itself periodically to work with new online sources and new bibliographic styles.
Please see the links below for more information on installing and using Zotero.