Kolab and ownCloud - the Free Cloud Solution (kolab.org)

Developer of the free Email- and Groupware-Solution Kolab meet and work together with ownCloud developers to create integrated Cloud solution for businesses and private users. The new Kolab 3.0 software scales all the way to thousands of users, but also runs on your small Freedombox at home. It enables people to take back control of their own data and even allows them to synchronize it with mobile devices. The solution can already be found in Fedora and other distribution should follow shortly. Furthermore it is planned to allow providers to offer cheap Kolab/ownCloud accounts, so you can choose the provider you trust and don't have to store your data at Google or set up your own server.