QuesTek:
Materials design

AQWTEC:
Developing predictive tools for the water industry

Tecplot:
Charge density visulaization software

Richard Bader:
Charge density topology and the theory of atoms in molecules

VASP:
The Vienna ab-initio simulation package

Amsterdam Density Functional (ADF):
ADF has a 30-year track record as a premium-quality quantum chemistry software package based on Density Functional Theory (DFT).