[General] Signals, Systems and Controls Demonstrations

This site, developed by Johns Hopkins University, contains a list of Java Applets in Engineering Education, with the objective to explore the use of the World Wide Web in engineering education. Some examples include "Joy of Convolution", which is a Java applet that "performs graphical convolution of continuous-time signals on the screen"; "Fourier Series Approximation", a Java applet that "displays Fourier series approximations and corresponding magnitude and phase spectra of a periodic continuous-time signal".

http://www.jhu.edu/~signals/