Tux Paint is a free and open source drawing application that's reliable, easy-to-use, fun, user friendly and helpful.
Here are some screenshots to illustrate the features and user interface of this application:
Drawing program specially designed for children that includes a collection of "starter" images, both coloring-book style. Screenshot of Tux Paint - 640px · 480pxDrawing software for children. Screenshot of Tux Paint - 640px · 480pxFree drawing app for kids. Screenshot of Tux Paint - 640px · 480pxChildren, ages 3 to 12. Screenshot of Tux Paint - 640px · 480pxTux Paint: Used in schools. Screenshot of Tux Paint - 640px · 480pxTux Paint: Fun sound effects. Screenshot of Tux Paint - 640px · 480px