ArgusLab is freely licensed. http://www.arguslab.com/arguslab.com/ArgusLab.html
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An application for modeling and visualization of molecules for quantum chemical calculation. This application implements a construction of
molecular structures with classical molecular dynamics simulation and structure optimization by simple generic force fields, and a preparation of input files for applications of quantum chemical calculation such as Gaussian. A binary package for Windows XP is available, and informal packages for Windows 7, iPad, and Linux exist.