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CONV. - Convert YouTube video to MP3, GIF or MP4
MP3 Converter - Mp3 Converter is a free to use as YouTube to MP3 converter that allows you to convert and download YouTube to MP3, MP4, F4V and 3GP formats.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
OnlineVideoConverter.com - OnlineVideoConverter.
Yout - YouTube to Mp3 Converter