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.
miniPaint - Online graphics editing tool use HTML5 technologies like Canvas, Offline support, Drag and Drop.
TwistedBrush Pro Studio - A powerful and unique natural media painting program.
Ultimate Paint - Ultimate Paint is a full-featured 32-bit Windows graphics program for image creation, viewing and...
GIMP - GIMP is a multiplatform photo manipulation tool.
JugiPaint - JugiPaint is a painting software with diverse tools for various types of illustration work.