RadarFDTD is a program to simulate electromagnetic waves propagating through various materials (the author used it mainly for Ground Penetrating Radar (GPR) applications, but it is not limited to this). Using generalized perfectly matched layers (GPML) as an absorbing boundary condition, huge simulation spaces can be realized (a few 100**3 cells). For smaller applications, these boundaries are not good since they need a vast amount of memory (128MB++). RadarFDTD is quite easy to use (it uses commented configuration files), but is quite efficient and fast.
