Eigenvalue Applet Version 1.0: Enter Your Own Potential
Enter the potential that you wish to see in the potential box. Then, enter the energy level that you wish to find in the "n=" box and you are good to go. Also, you may right click and drag the mouse in the energy level diagram to see how the wave functions converge and diverge around the energy levels. For really fine adjustment around your chosen energy levels, click and hold the buttons marked <<,<,>,>>. They will increment and decrement the energy around the levels in smaller steps than possible when using the mouse. Enjoy.
See the potential well example