Zotero is a research tool that collects all your research in a single, searchable interface.

You can add PDFs, images, audio and video files, snapshots of web pages, and more. Zotero automatically indexes the full-text content of your library, enabling you to find exactly what you’re looking for with just a few keystrokes. You can also use Zotero to easily create citations and bibliographies in a variety of different styles.