Gesture Synth (gesturesynth.org)

Gesture Synth at gesturesynth.org is a browser music game that uses webcam-based hand tracking to play synth chords and shape filter, volume and octave.

It is the only version in this category that presents itself as a game rather than an instrument, which suggests a different emphasis on scoring or progression than the performance-oriented versions.

Details below are taken from the site's own published description rather than hands-on testing. No pricing is published.