The deMon Developers is an international group of researches dedicated to the development of the software package deMon (density of Montreal) that includes a number of quantum chemistry programs. The software emerged in the 1990’s within the research group of the Prof. (Dr.) Dennis R. Salahub in the University of Montreal. It uses the linear combination of Gaussian-type orbital (LCGTO) approach for the self-consistent solution of the Kohn-Sham (KS) DFT, auxiliary density functional theory (ADFT) and Hartree-Fock equations. The particular features of deMon2k are Quantum Mechanics (QM), Molecular Mechanics (MM) and hybrid QM/MM energy models. They can be used for structure and transition state optimization as well BOMD simulations. 

For larger scale systems, deMonNano program provides a modern implementation of the density-functional tight-binding (DFTB) approach, including self-consistent charge (SCC), dispersion and polarization corrections, and the treatment of excited states through the DFTB-CI method. Several molecular dynamics approaches such as BOMD, Car-Parrinello, meta-dynamics, path integral and parallel tempering are also available.