COSMOSS is a Matlab based spectral simulation package. The simulation focuses on vibrational excitations, where each of the locally excited modes is treated as a harmonic oscillator (ωi) that coupled (βij) to each other.
The code is currently maintained on the GitHub: https://github.com/JJ-Ho/COSMOSS
There is a Wikipedia that explains this code: https://github.com/JJ-Ho/COSMOSS/wiki The wiki pages are still under construction. The code and websites will be updated soon.