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• EndNote
  Software designed to collect and organize research (among other things); compatible with EndNote Web. Yale University has EndNote available to students, faculty, and staff for free. The desktop version (recommended) is a download from the ITS Software Library (look in the Software & Technology tab). 
• Mendeley
  Mendeley is a free reference manager and academic social network that can help you organize your research, collaborate with others online, and discover the latest research
• RefWorks
• Web-based tool available through the Yale University Library databases; free access to all Yale affiliates; ability to work off-line as well.
• Zotero
  Free, web-based tool that works as a plug-in within Firefox. Zotero also has a desktop client that works well on all platforms.
   
  For information on EndNote, EndNote Web, Mendeley, RefWorks, and Zotero, see the library's Citation Management subject guide.