YouTube Mp3Mp4 | How to Convert YouTube MP3/MP4 Easily
10 Best MP3 and MP4 YouTube Downloader for Firebox
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GitHub - Alegar917/MP3-MP4-downloader: A personal youtube mp3/mov/mp4 downloader
Microsoft Apps
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
Convert YouTube Video to MP3, MP4 on Mac OS X
Simple YouTube to MP3/MP4 Converter and Downloader – Get this Extension for 🦊 Firefox (en-US)