Freeware Programs: ab-initio.mit.edu
Download Harminv 1.3.1

Harminv 1.3.1  Harminv is a free program (and accompanying library) to solve the problem of harmonic inversion — given a discrete-time, finite-length signal that consists of a sum of finitely-many sinusoids (possibly exponentially decaying) in a given bandwid

Download MIT Photonic-Bands 1.4.2

MIT Photonic-Bands 1.4.2  The MIT Photonic-Bands (MPB) package is a free program for computing the band structures (dispersion relations) and electromagnetic modes of periodic dielectric structures, on both serial and parallel computers.