Tilt Brush - Paint in spaces around you with Virtual Reality
PaintCode - PaintCode is a unique vector drawing app that generates Objective-C or Swift code in real time, acting as a bridge between developers and graphic designers.
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
JS Paint - JSPaint is a web-based Microsoft Paint remake
A-Painter - Paint in VR in your Browser
Paintr - Painting with your smartphone.