Ghemical is a computational chemistry software package written in C++ and released under the GNU General Public License. The program has graphical user interface based on GTK+2 and supports quantum mechanical and molecular mechanic models, with geometry optimization, molecular dynamics, and a large set of visualization tools. Ghemical relies on external code to provide the quantum-mechanical calculations — MOPAC provides the semi-empirical MNDO, MINDO, AM1, and PM3 methods, and MPQC methods based on Hartree–Fock calculations.

Ghemical 2.0.1 screenshot.png
A screenshot of Ghemical 2.0.1.
Developer(s)Ghemical authors
Initial release?
Written inC++
Operating systemUnix-like
Available in?
TypeComputational chemistry

The chemical expert system is based on OpenBabel, which provides basis functionality like atom typing, rotamer generation and import/export of chemical file formats.

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