Greasy Fork is available in English.

YouTube™ MP3 Downloader v4.4 (Relaunched) 🚀💯 - YTMP3x.com (NO ADS & NEW LAYOUT FOR YT! 🚫🤩)

This script adds a download button, a faster way to download audio from YouTube and with guaranteed quality. This site is very simple, fast and effective to download! Best of all!