arkOS is an open source project designed to let its users take control of their personal data and make running a home server as easy as using a PC
arkOS is not a solution to the surveillance state, but it does offer an alternative to those who would rather exercise some measure of control over their data and, at the very least, not lock away their information in online services where its retrieval and use is at the whim of a corporation, not the user.
Full article here:
arkOS: Building the anti-cloud (on a Raspberry Pi) (TechWorld)
arkOS aims to let anyone host their own cloud with a $35 Raspberry Pi (Liliputing)