*Mendeley is a "freemium" service, which means the basic account, which provides 2 GB of storage, is free.
Mendeley is compatible with Mac (through Mojave), Windows, and Linux. You can save PDFs to your Mendeley Desktop and your Mendeley web library (web and desktop applications sync together) via a browser plug-in, Mendeley Web Importer. Mendely provides a Microsoft Word integration citation tool plug-in.
Mendeley replicates features that are found in other citation management tools (EndNote, RefWorks, Zotero) but has as its strengths: reference manager, PDF organizer, reading platform, and annotation tool. The Mendeley Desktop (the original application) and Research Manager (the newest version of the application) are research tools that assist you at every stage of the research process, from gathering research to reading and annotating PDFs to organizing citations and creating bibliographies.
You cna open a free* Mendeley account and download the Mendeley Desktop and/or the Mendeley Research Manager appliations.
You should see "insert and edit citations" and "merge citaitons" with the Mendeley icon. Open Word, and click on the "Reference" tab toward the top of your document. If you are Using Mendeley Desktop, the original application, which is still being supported, you simply open the Desktop application, go to the tools menu and toggle the "Install Mendeley MS Word plugin" that you will see on the dropdown. The Libraries/SAS IT Help Desk can assist you with this process if you have questions: the citation plugin add-in download for Mendeley Reference Manager at : However, for most Penn Schools there is a workaround. Your school may allow you to add the citation plugin yourself. If you are using Microsoft 0365 provided through Penn, you will want to find out about your ability to add this "add-on." Some Penn schools and centers are adding in the Zotero and Mendeley add-ons as a default.
Mendeley's Reference Manager, the most recent version of the Mendeley desktop application, requires an "add-on" for the Mendeley MS Word citation plugin.