TuxFamily, France
TuxFamily is a non-profit organization which provides free services for projects and contents dealing with the free software philosophy (free as in free speech, not as in free beer). It accepts any project released under a free license (GPL, BSD, CC-BY-SA, Art Libre…).
TuxFamily uses around 20 physical Debian servers on mixed amd64/i386 architectures and around half dozen Debian running on virtual machines.
TuxFamily has used Debian for more than 15 years, most TuxFamily administrators are Debian-fanatics and perfectionists. All of them are fond of the way that stable Debian releases are perfectly finished with all the love required to reach perfection.