ZendTo is known within the University of Southampton as the "Dropoff" service.
It provides a very quick and easy method of transferring (potentially very large) files securely to anyone in the world, if you are a member of the University, and to anyone in the University if you are not a member of it. All you need is the email address of the recipient(s): no magic passwords or usernames.
It is widely used throughout the world by large organisations including the US Navy and the French government, in addition to multiple universities and companies.