MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Microsoft Paint - Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included...
ZBrush - ZBrush is a digital sculpting and painting software solution.
GIMP - GIMP is a multiplatform photo manipulation tool.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.