Tux Paint - Tux Paint is a free, award-winning drawing program for children ages 3 to 12 (for example, preschool and K-6).
GIMP - GIMP is a multiplatform photo manipulation tool.
Painty - Kid, if you have a dream to paint the best picture in the whole world, this is the place to start...
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.
Lil' Picasso - Lil Picasso is a coloring and creativity package for children.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.