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Gaussian is arguably the most-used computational quantum-chemistry program. It does electronic-structure calculations and standard quantum chemical calculations. Among the methods available are simple molecular mechanics (such as Amber force field), semi-empirical methods (such as CNDO), Hartree-Fock (restricted and unrestricted), MPn (Mollar-Plesset perturbation theory of order n=2,3,4), CI (Configuration-Interaction), CC (Coupled-Cluster), Multi-configurational SCF (such as CAS-SCF) and various DFT (Density-Functional Theory) methods. Specific to Gaussian are high-accuracy energy methods (G2, CBS). It can be used to obtain electronic properties, molecular geometries, vibrational frequencies, orbitals, reaction profiles, and much more.
For a more complete list see this Overview.
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