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.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
ZBrush - ZBrush is a digital sculpting and painting software solution.
Corel Painter - Corel Painter is media painting software.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.