Many research universities and academic departments purchase site licenses that cover their faculty, staff, and students. Check your department

ORCA is a powerful quantum chemistry program package. It is free for academic use and has rapidly grown to rival Gaussian in popularity.

Free for everyone, though registration is required to download.

Gaussian 16 software has a wide range of features and applications, including:

:

Developed by the Pacific Northwest National Laboratory, NWChem is designed to handle biomolecules and materials.

Cracked versions of computational chemistry software often suffer from compilation errors or missing dependencies, leading to corrupted calculations and invalid research results.

ORCA is a highly popular, modern electronic structure program. It is free for academic and non-commercial use.