These are excellent tools to visualize the basic postulates of Quantum Mechanics. The physical observables demonstrated in the applets are well chosen and allow for rapid serial imprinting of the basics of the theory. I believe that student brain time devoted to insufficient mental models of QM is better served by something like these applets which allow the mind to jump an abstraction layer conceptually. This is a good, non-mathematical starting point for QM.
All the remarks that went with the applets were well written and did teach me new some new physics I had not known about. The only thing I could think to improve would be to specify in the wave packet applet whether or not the wave packet is the minimum uncertainty (Gaussian).