Windows Mobile 5 & 6 only: Free open source media player MPlayer, long known to Linux fans for its format friendliness and streamlined operation, has been ported in somewhat rough fashion to Windows Mobile-powered smartphones. While that means formats like RealAudio/Video, Ogg, M4A and others are playable, users are reporting that the program is a monster when it comes to processor use (which also makes it a battery killer) and has only the most basic "open file" functionality. But if you've got a low-quality file or a powerful phone, it could make for a nifty toy to play with until it gets fixed. MPlayer is a free download for Windows Mobile 5 and 6 phones only.

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