FIEND.fm - "Hot or Not" for music discovery: 2 hrs of tracks in 2 mins
last-slack - Display your scrobbled tracks from last.fm in Slack
Pacemaker - Create and share mixtapes with friends
Owlead - Grow your Twitter with valuable followers, effortless
Boil the Frog - Create a seamless playlist between any two artists
Sound Control - App-specific volume control