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.
Corel Painter - Corel Painter is media painting software.
Artrage - A simple but lovely natural media painting and sketching program.
Fresh Paint - Microsoft's new painting software with more realistic brushes for Windows 10
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.