YouTube Converter - YouTube To Mp3 Core PHP Ajax Based Script | CodeHap.com
YouTube™ MP3 Downloader 🚀💯 - YTMP3x.com (NO ADS 🚫)
YouTube™ Multi Downloader 🚀💯 - yt1s.com (MP3, FHD, MP4, HD, SD, 3GP / NO ADS 🚫)
GitHub - leotakacs/YouTube-MP3-Tampermonkey-Script: An automated Tampermonkey script for extracting and downloading audio from a YouTube video. Uses loader.to's YouTube MP3 site.
Easy Google Chrome YouTube Downloader Add-on (2020 Update)