Newest versions of components are Mendeley Reference Manager, Mendeley Web Importer, and Mendeley Cite.
2 GB of web storage included for free
Works on Macs or PCs
Comes with nearly 7000 citations styles and you can edit styles
Provides ability to annotate and store full text documents with their references
Mendeley Cite inserts in-text citations and creates dynamic bibliographies as you write
Export files are compatible with BibTeX, EndNote, RefWorks, and Zotero
Sign up for your free account at https://www.mendeley.com/. A comparison of reference managers is available in Wikipedia. Learn how to sign up for an account online, install Mendeley on your desktop, install additional tools, and use the basic functions from Mendeley's collection of online guides.
Drawbacks of Mendeley Reference Manager
Not entirely online
Web Importer does not consistently capture references and full text documents. You will have to import references and download/attach full text documents about 80% of the time or drag and drop downloaded pdfs.
Cannot generate standalone bibliographies. You either have to create one while writing a Word document, or copy and paste the references you want from Mendeley desktop into a Word document.