Download MediaPortal (Windows)

Windows only: Turn your PC into a full-fledged media center with MediaPortal, an open-source alternative to Microsoft's own Media Center Edition OS.

MediaPortal can play, record and timeshift TV; play videos and DVDs; run photo slideshows; play your music library and FM radio; show local weather; and much more. In short, it offers everything a good media-center application should, all wrapped in a friendly, attractive interface. It even comes with open-source MPEG-2 decoders, a nice extra for systems that don't already have one.
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