If you are a member of the University of Southampton, please note that ZendTo has already been setup for you and is available at dropoff.soton.ac.uk.
ZendTo is completely free of charge, requiring no licence, installation or subscription fees. Free assistance is provided through mailing lists and email.
ZendTo was originally based on the "Dropbox" package written by the University of Delaware, but now has many differences. I am eternally grateful to them. It does not have, and never has had, any relation whatsoever to the commercial service available at www.dropbox.com. That is a totally different product, and is nothing more than an accidental name clash.