Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources
Zotero is a perfect replacement for EndNote. Zotero is the only research tool that automatically senses content in your web browser, allowing you to add it to your personal library with a single click. Whether you're searching for a preprint on http://bit.ly/2FHDPrE, a journal article from JSTOR, a news story from the New York Times, or a book from your university library catalogue, Zotero has you covered with support for thousands of sites.
Zotero collects all your research in a single, searchable interface. You can add PDFs, images, audio and video files, snapshots of web pages, and really anything else. 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.
It will install on Windows, MacOS and Linux and integrates with Chrome, Firefox and Safari browsers. It also has numerous 3rd party connectors that will integrate into AtoM, WordPress, Drupal, MS Word, LibreOffice, etc.