Raspbmc
Raspbmc (http://www.raspbmc.com/) is a Linux distribution based on Raspbian that lets you run XBMC (now called Kodi) on your Raspberry Pi. Kodi is an award-winning media player and entertainment hub designed to run on as many different devices as possible, including the Raspberry Pi.
Thanks to the Broadcom CPU and VideoCore IV graphics engine, the Raspberry Pi has more than enough power to handle media playback. This allows you to turn your Raspberry Pi into a powerful, extremely low-cost media center with low power consumption.
By installing Raspbmc on your Raspberry Pi, you can turn your Raspberry Pi into a fully-featured media center that can play movies and music on your TV. Kodi lets you use any smartphone or tablet with Wi-Fi as a remote control.