Here is description of mypaint.
Mypaint is a fast and easy/simple painter app focused on the painter, so you can only focus on the art and not the program itself. Currently MyPaint does not have a layer system, also mypaint is using pygtk with C extensions.
One of the interesting feature is that the width of the brush increse’s with the speed of the stroke.
My personal experience with the application was that the appllication does not have too many functionalities but is really very easy to use.
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