Google Contacts, the address book built into Gmail, lets you keep track of all your contacts, see when you last interacted with them, and more.
Mark duplicate project files across shared document folders.
Get a linked review list of exact copies across your shared folders, with extra files marked where they sit so you can decide what to keep.
Find exact copies of project files and record each kept location.
You can clear exact duplicate files from a shared folder and see what stayed, what went to trash, and what still needs your choice.