Princeton University Library provides professional accounts for Overleaf, an easy to use, online, collaborative LaTex editor. Overleaf professional accounts allow syncing with Drop-box and Github, track changes, unlimited collaborators, and more. To get started visit https://www.overleaf.com/edu/princeton or sign up for a workshop.
Bibliographic management tools work directly with library databases and the web, allowing you to collect and organize your citations and pdfs. They also work with word processing software like Word to allow you to insert properly formatted citations into your paper and automatically generate a properly formatted bibliography. Some popular free citation managers supported by Princeton are:
