XBMC

About the project

XBMC/Kodi is an award-winning free and open source (GPL) software media player and entertainment hub that can be installed on Linux, OSX, Windows, iOS, and Android, featuring a 10-foot user interface for use with televisions and remote controls. It allows users to play and view most videos, music, podcasts, and other digital media files from local and network storage media and the internet. Our forums and Wiki are bursting with knowledge and help for the new user right up to the application developer. We also have helpful Facebook, Google+, Reddit, Twitter and Youtube pages.

Website: http://kodi.tv/

Linux Distributions for Raspberry Pi:
 * OpenELEC
 * RaspBMC
 * XBian

Interfaces:
 * UPnP/DLNA
 * Webservice (remote control)

Side project
 * Extensions_XBMC
 * Floatingimage UPnP feed