by S.Kamikawa, high school Physics teacher in Japan.

http://www.bekkoame.ne.jp/~kamikawa/
java_e.htm/

A variety of simulations for Internet Explorer 3.0. These are simple but show the patterns of waves nicely:
Longitudinal Wave; Reflection of Longitudinal Wave from a Boundary; Transverse wave and Longitudinal wave; Simulation of Transverse wave and Longitudinal wave;
Wave Interference, Animation of Interference Pattern Formed by Two Points Sources.

Fu-Kwun Hwang, National Taiwan University Department of Physics.

http://www.phy.ntnu.edu.tw/~hwang/

A very nice series of wave and oscillation applets: Superposition Principle of Waves and Pulses, a great Fourier Synthesizer,Transmission of Waves (Reflection and Refraction), and Interference Between Two Waves (Two Point Sources).

by S.Kamikawa, high school Physics teacher in Japan.

http://www.bekkoame.ne.jp/~kamikawa/
java_e.htm/

A variety of 1- and 2-D java animated JAVA applets (step through them if they run too fast on your machine). These are simple but show the mechanics of simple transverse and longitudinal waves (simple pulses and reflections, together with standing waves and self-interference) with fixed and free boundaries.