XBMC (aka Xbox Media Center) is a free, open-source media center application designed, in the beginning, for the original Xbox. XBMC has made serious progress over the past year or so and can now run virtually anywhere-including Windows, Mac, Linux, and Apple TVs.

Not only is XBMC an incredible media center app with tons of great add-ons and customization options, but it’s also spawned several popular forks, including Boxee (mentioned below). XBMC is in constant development and has gotten better and better at running on your PC, but if you’ve got an old Xbox hanging around, here’s how to transform your classic Xbox with XBMC.