Noted - Social music discovery
CONV. - Convert YouTube video to MP3, GIF or MP4
MusicHarbor - MusicHarbor is an app that helps you stay on top of new music releases, music videos, events, and news from all your favorite artists and record labels.
Yout - YouTube to Mp3 Converter
Openwhyd - Collect and Share the tracks you love.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline