NTNU Virtual Physics Laboratory
Excellent Java animations by Fu-Kwun Hwang of National Taiwan Normal University, spanning many topics in 23101 and 23102.

Explore Science,
by Raman Pfaff. Includes a few 23102 topics, like optics.

Voltage Circuit Simulator,
by several folks at the U. of Oregon.

The Virtual Laboratory
This is probably the most comprehensive links page to physics Java Applets and similar stuff.

Physics Applets
A useful page of links - a few are broken, but most are good.

SciPhy Virtual Laboratory
More links