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.
Pigment by ShapeFactory - A unique way to explore color using lighting and pigment
Clip Studio Paint - The artist's software for drawing and painting.
ColorMe - Visualize The CSS Color Function
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
ibis Paint X - Drawn with + ibisPaint