Music on Vine - Vine, now with music. Make 6-second music videos.

last-slack - Display your scrobbled tracks from last.fm in Slack

Storybeat - Storybeat app comes up with features to help you in changing the background music of your videos in a few simple steps to share your favorite moments with your social media friends.

Owlead - Grow your Twitter with valuable followers, effortless

Triller - Make celebrity-quality videos with a few taps of your phone

Sound Control - App-specific volume control