Gaussian 09 supports a wide range of methods, allowing users to balance accuracy and computational cost:

Most major universities, national labs, and research centers have a site license for Gaussian. Check with your:

Most free executables of licensed software contain Trojans or ransomware.

While Gaussian does not offer a direct trial, some high-performance computing (HPC) centers that host Gaussian allow free academic access to their clusters. Examples include:

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