Link: Download Doppler Effect Model Free - Analyze the Doppler effect with this tool. - Softpedia

Doppler Effect Model is a handy, easy to use application designed to enable you to view the detection of sound waves from a moving source and the change in frequency of the detected wave via the Doppler effect. In addition to the wave fronts from the source a graph depicting the time of emission and time of detection of each of the wave fronts is given. The speed of sound, the velocity of the source and the position and velocity of the detector can be changed via text boxes.
Screenshot: Doppler Effect Model Screenshots, screen capture - Softpedia