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.
Artrage - A simple but lovely natural media painting and sketching program.
Autodesk SketchBook - SketchBook drawing and painting software provides designers, architects, and concept artists the tools to sketch ideas quickly and create beautiful illustrations.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Clip Studio Paint - The artist's software for drawing and painting.
ibis Paint X - Drawn with + ibisPaint