Children can draw and have fun with it. It is also translated to many languages of the world, so children will understand which command or button to use.
We can use it at home or at kindergarten or at school.
I made few tutorials and you'll see it is really easy to use.
It is available for Windows, Apple Mac and Linux, and we can also download portable version of it.
We can download Tux Paint here: http://tuxpaint.org/download/
Or find out more about Tux Paint on their webpage: http://tuxpaint.org/
And this is how Tux Paint looks like:
and
And here are my Tux Paint tutorials: