Sculptura - 3D sculpting for everyone
Nomad Sculpt - Nomad is a sculpting & painting mobile app, available on Android and iOS.
Massless Pen - A pen for drawing in virtual reality
ZBrush - ZBrush is a digital sculpting and painting software solution.
PaintCube - Web-based 3D painting software
Blender - Blender is the open source, cross platform suite of tools for 3D creation.