There are many popular choices to sort and mange your references, including

1. Mendeley (free with a very low GB limit)
2. Endnote (not free, commonly used by Windows/Word users)
3. Zotero (free with a very low GB limit)

It can be very annoying to go through VPN every time when downloading a paper from a journal UIUC has a subscription for. The bookmarklet from the library makes this process easier and faster : https://www.library.illinois.edu/library-technology/proxy-bookmarklet/

1. https://en.wikipedia.org/wiki/Comparison_of_reference_management_software