MasterpieceVR - Powerful VR sculpting & painting tool
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Snap Art - Snap's augmented reality platform
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
A-Painter - Paint in VR in your Browser
Kauna - Kauna is a music visualizer. Kauna renders any sound reproduction in system.