FreedomBox

FreedomBox is a personal server that protects your privacy. It hosts on demand applications such as file sharing, shared calendaring, instant messaging, secure voice conference calling, blog and wiki. FreedomBox is a free software stack, a subset of the Debian universal operating system, that can be installed in many flavors of inexpensive and power-efficient hardware. The simplicity of setting up and operating a FreedomBox is similar to that of a smart phone.

See Debian:FreedomBox