MasterpieceVR - Powerful VR sculpting & painting tool
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
A-Painter - Paint in VR in your Browser
Snap Art - Snap's augmented reality platform
Quill by Story Studio - Paint in virtual reality on an infinitely scalable canvas
VR Sketch - A tool for designers to draw inside virtual reality