Mendeley is a free reference management software package, also known as bibliographic software, which enables you to:
There is also a new add-in for MS Word, called Mendeley Cite, which can be used without the desktop app.
Mendeley have guidance on all applications:
Mendeley Desktop continues to be available for existing users but is no longer available to download and is no longer under development. For guidance on using the new Mendeley Reference Manager, Mendeley Cite and Mendeley Web, see our Mendeley guide.