Here you may find some educational tools to teach or further understand electrodynamics/electromagnetism. If you think that you have some small or large program, visualization etc., please feel free to contribute.
With the freely available interactive FDTD toolbox you can simulate and visualize the electromagnetic field in a structured material such as a photonic crystals, waveguides or investigate refraction at dielectric boundaries and diffraction in free space.
Tutorials to get to know The Interactive FDTD Toolbox. Please feel free to give us some feedback if you like.