The current version of Flutter (0.1.237 — don’t be afraid, it’s not a beta version, the developers just want to add more features before calling the app 1.0) supports three gestures: a flat open hand, ...

With Flutter, you can use a wave or hold up your hand to control iTunes or Spotify music on your computer. All you need is a webcam and the app.

Called Auri Music, the player is created by a redditor who says they decided to build their own app because the existing ones “lack some features which I would deem crucial.