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Symofros is a robotics modeling software originally created by the Canadian Space Agency. Symofros basic functions include modeling Kinematics, Non-linear dynamics, Linear dynamics, Dynamics for constrained systems, and Systems with flexible links.
The Dutchroll project provides Open Source applications for Matlab and Simulink, with the emphasis on aerospace engineering. The main application is the Flight Dynamics and Control toolbox; other applications will be derived from that toolbox.