The units used in these applets are potentially confusing. Students are asked questions to determine the units employed for the infinite square well (hbar2/2m = 1). If they don't understand this, it will be difficult for them to determine quantitative results from the graphs. There is no discussion of units for the finite square well. There is no indication of units on the graphs themselves.
Left clicking on the wavefunction graphs gives results of x, E, and y. These last two are confusing because it is uncertain what the E corresponds to (moving the cursor changes E?), and the values of y imply that the wavefunctions are not normalized to 1.
For the finite square well, it is unclear if the wavefunctions for different energies are normalized to the same relative value. This will distort the relative shapes of wavefunctions of different energies,
or wavefunctions for different size wells.
In the infinite well applet, the boundary conditions on the calculation are listed as Y(a) = Y(-a) = 0. It should be stated that in the simulation a = 1, as is done in the Physlets book for the finite square well. This probably should be stated directly in both cases on the web site.
The term "Principal" quantum number is used in these examples. This is nonstandard usage for 1D bound state problems where there is only one quantum number.