From Bot Square:
With Flutter, play and pause your songs, movies, and shows with gestures using hand. It detects your gestures through the webcam and responds according to it. It can control Windows Media Player, Spotify, Quicktime, Winamp and iTunes. Flutter sits silently in the notification area and only spring up to action once you perform the hand gesture in front of the webcam and the music is stopped. Once you are ready to start listening again, show your hand in a similar manner and the music will start playing again. The app delivers a perfect experience while playing and pausing music with hand gestures.