Mendeley: The new Mendeley Reference Manager helps you simplify the tasks of building and organizing your reference library, making notes and annotations across papers collaborating with others and inserting citations and bibliographies into the papers you are writing. It is available as both a desktop and a web app.
Download Mendeley Reference Manager for Desktop at:
https://www.mendeley.com/download-reference-manager/windows
Access Mendeley Reference Manager Webapp at:
https://www.mendeley.com/reference-manager/library/all-references