Zotero is a tool for storing, retrieving, organizing, and annotating digital documents.
It has been available for not quite a year. I started using it about six weeks ago, and am still learning some of the fine points, but feel sufficient enthusiasm about Zotero to recommend it to anyone doing research online. If very much of your work involves material from JSTOR, for example – or if you find it necessary to collect bibliographical references, or to locate Web-based publications that you expect to cite in your own work — then Zotero is worth knowing how to use. (You can install it on your computer for free; more on that in due course.)
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Source: Inside Higher Ed