http://ktoon.toonka.com/ "KToon is a 2D Animation Toolkit designed by animators (Toonka Films ) for animators, focused to the Cartoon Industry. This project is covered by the GPL License using G++, OpenGL and QT as programming resources from KDevelop as the development platform. By now, KToon is only available for Unix systems but we expect to make it works on Windows systems too someday." Let's have an eye on it...