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.
Artweaver - Artweaver is a simple Freeware program for creative painting, i.e.
Artrage - A simple but lovely natural media painting and sketching program.
Sketchable - Creators of Sketchable!
Procreate - Procreate is the most powerful and intuitive digital illustration App available for iPad®.
Clip Studio Paint - The artist's software for drawing and painting.