Download MOPAC for Windows (minimal zip file if Qt installer has problems) Version = 23.1.2 (February 17, 2025 release) Final closed-source releases of MOPAC2016 (not supported):

MOPAC (Molecular Orbital PACkage) is a semiempirical quantum chemistry program based on Dewar and Thiel's NDDO approximation. Most users use MOPAC with a Graphical User Interface . MOPAC2016

With over a century of experience in the recycling and rendering industry, MOPAC has been sustainably supporting the region since 1906. We specialize in the collection of used cooking oil and tallow, transforming these waste materials into valuable resources.

This is the official repository of the modern open-source version of MOPAC, which is now released under an Apache license (versions 22.0.0 through 23.0.3 are available under an LGPL license). This is a direct continuation of the commercial development and distribution of MOPAC, which ended at MOPAC 2016.

MOPAC2016 is the successor to MOPAC2012. MOPAC2012 will no longer be supported. Customers with MOPAC2012 support will be able to upgrade to MOPAC2016 at no cost. What's new in MOPAC2016™ ? • Improved handling of large biomolecules.

MOPAC [1] is a general-purpose semiempirical quantum chemistry engine for the study of molecular and periodic structures. This manual documents the MOPAC engine in the 2024.1 release of the Amsterdam Modeling Suite.

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Molecular Orbital PACkage. MOPAC has 6 repositories available. Follow their code on GitHub.

MOPAC , the Molecular Orbital PACkage, is software for performing quantum chemistry calculations based on semiempirical thermochemistry models (e.g. AM1, PM3, PM6, PM7). MOPAC has been under active development since 1981, led by James J. P. Stewart.

MOPAC is a general-purpose semiempirical molecular orbital package for the study of solid state and molecular structures and reactions.