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.
GIMP - GIMP is a multiplatform photo manipulation tool.
TwistedBrush Pro Studio - A powerful and unique natural media painting program.
Paint.NET - Paint.NET is a free image and photo editing software.
Corel Painter - Corel Painter is media painting software.
Artweaver - Artweaver is a simple Freeware program for creative painting, i.e.