GIMP - GIMP is a multiplatform photo manipulation tool.
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.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
ZBrush - ZBrush is a digital sculpting and painting software solution.