Georgia State University
Georgia State University: Hyper Physics: Electron Spin
An excellent overview of electron spin, what it means in non-mathematical terms and quantum mechanical terms.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Stern Gerlach Experiment
An interactive simulation that teaches about quantum mechanics, spin, and quantum measurement through a classic Stern-Gerlach Experiment. By observing the spin of atoms as an intrinsic angular momentum, students learn to measure to reach...
Khan Academy
Khan Academy: The Quantum Mechanical Model of the Atom
An explanation using quantum mechanics to describe the atom.