Yout - YouTube to Mp3 Converter
Bowtie - Bowtie is a desktop accessory that allows you to see and control your music (iTunes, Spotify...
CONV. - Convert YouTube video to MP3, GIF or MP4
Muzzy - it’s a tiny and gorgeous iTunes companion that lives on your menu bar. For Mac OSX, its free!
SoundCloud Go - Your favorite music and new discoveries, offline and ad-free
Owlead - Grow your Twitter with valuable followers, effortless