Zotero

What Zotero Does

Zotero (pronounced "zoh-TAIR-oh") is a citation manager that allows you to attach PDFs, notes and images to your citations, organize them into collections for different projects, and create bibliographies. It's easy to use and connects with your web browser to download sources. 

You are given 300 MB of storage space for free from Zotero; additional storage is available for reasonable fees.