WOLFSIM is now available for free download on sourceforge.net. There are two versions available for download. WOLFSIM 2.0.0 contains the source code with HDF5, while WOLFSIM 2.0.1 contains the source code without HDF5.
Detailed instructions on how to install and run WOLFSIM as well as examples can be found on our project webpage: http://www.ece.ncsu.edu/oleg/wolfsim/index/WOLFSIM_\(Wideband_Optical_FDTD_Simulator)