Artweaver - Artweaver is a simple Freeware program for creative painting, i.e.
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.
Sketchable - Creators of Sketchable!
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
Clip Studio Paint - The artist's software for drawing and painting.
Corel Painter - Corel Painter is media painting software.