Atkins, de Paula & Friedman: Physical Chemistry: Quanta, Matter, and Change 2e
CRC Handbook of Chemistry and Physics
Data may be accessed after purchasing a personal or institutional subscription.
The Particle in a Box
Energies and wavefunctions are calculated interactively for a particle in a box. The user can move smoothly between the regular square well potential to the double square well with variable barrier height and width.
Quantum Mechanics in Chemistry
Online book by Jack Simons and Jeff Nichols.
Wikipedia encyclopaedia extract on quantum tunnelling.
Applied Quantum Mechanics
Detailed information on a simple harmonic oscillator model.