Synfig
Synfig is a powerful, industrial-strength vector-based 2D animation software package, designed from the ground-up for producing feature-film quality animation with fewer people and resources. While there are many other programs currently on the market to aid with the efficient production of 2D animation, we are currently unaware of any other software that can do what our software can.
Ktoon
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.