Do you need help transitioning from Mendeley Desktop to Mendeley Reference Manager? Here's a guide to help you out! Migration Guide for Mendeley Desktop Users
Mendeley is a citation management tool that, like many others, lets you collect & organize citations, & then easily insert them into documents & format bibliographies.
You can highlight and annotate your PDFs. Choose a color (not just yellow!) for your highlights and notes.
Use more than one computer? Download Mendeley Reference Manager to as many computers as you want, then sync them with a click of your mouse. Need to use your library away from your computer? Mendeley on the Web gives you access to your citations no matter where you are with an interface the same as Mendeley Reference Manager.
Collaborate by creating collections of papers in private groups. You can share PDFs (and your annotations) with anyone who is a member of your group.
The free version of Mendeley has some limitations on space (2 GB web storage, 500 MB each for personal shared storage) and users (25) for private, invite-only groups, but you can purchase premium plans for more web & personal storage space & more users & shared groups.
If you need more help with Mendeley