A very rich
collection of interactive Java applets teachers and students can use to
illustrate abstract concepts. The applets cover the topics of
Mechanics, Oscillations and waves, Electrodynamics, Optics,
Thermodynamics, Physics of Atoms and Nuclear Physics.
These Java applets can be viewed online but can also be downloaded and installed on content servers on the school Intranets.

http://www.walter-fendt.de/ph14e (Java 1.4 applets)
http://www.walter-fendt.de/ph11e (Java 1.1 applets)