Mendeley is a freely available web-based reference manager that can also be used offline. Mendeley's free account offers 2GB of personal library space and the ability to create 5 private groups with up to 25 members and 100MB shared storage across all groups. Individuals can upgrade to a premium plan to access more space and/or create larger groups.
As of September 2022, Mendeley offers the following downloads. Previously, Mendeley offered Mendeley Desktop and Mendeley Desktop Citation Plugin as alternatives; anyone who still has those products can continue to use them. If you previously used Mendeley Desktop and want to move to Mendeley Reference Manager completely, see these instructions on removing Mendeley Desktop from your computer.
To manage your references and build your library:
To insert citations and bibliographies into your document:
To build your reference library while discovering articles online:
Reference managers (also called citation managers or bibliographic management software) offer a way to save, organize and manage references. Many work with word processing software to format in-text citations and bibliographies for papers and theses, allow you to share references, and enable you to attach or link PDFs to a citation record.
Wikipedia comparison of reference management software
Zotero (recommended)