GitHub - barclayd/YouTube-Downloader: Download and convert any YouTube video to MP4 or MP3. Built using Node.js
tubidy : Mp3 Downloader – Download YouTube videos in MP3, MP4, 3GP - TIME BUSINESS NEWS
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Amazon.com: Video and Audio Downloader software for YouTube – download your favorite YouTube videos as MP4 video or MP3 audio – lifetime license – computer program compatible with Windows 11, 10, 8 and 7
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y2mate - youtube to mp3, mp4 converter & downloader