Greasy Fork is available in English.
YouTube MP3 Downloader v1.3 - Youtubemp3lab.com (The BEST site for MP3! NO ADS!)
Compatible with YouTube Multi Downloader! No ads, this script helps you add a download button. YouTube MP3 Lab presents the fastest ways to download YouTube audio, ensuring quality. This site is very simple, fast and effective to download! Best of all!