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Gaussian.com is the official site for Gaussian, Inc., home to the Gaussian family of computational chemistry software. It offers product information, licensing, documentation, tutorials and training, technical resources, case studies, and access to support and updates.
More resources on Analytical & Computational Chemistry
Physical Chemistry
Ten-module University of Manchester course covering first-year thermodynamics, chemical kinetics and quantum chemistry. Working through the assignments, you can apply the laws of thermodynamics, derive rate laws, and interpret atomic and molecular spectra.
Essentials of Computational Chemistry
Graduate-level text on the theory and practice of computational chemistry: molecular mechanics, Hartree-Fock and semiempirical methods, density functional theory, correlated methods, solvation models, and simulation. Readers learn which method suits a chemical problem and how to judge the reliability of results.
chem.libretexts.org
LibreTexts Chemistry is a free, open‑access library of General Chemistry textbooks and learning resources, offering modular chapters, tutorials, and practice problems. It covers core topics from matter and measurements through thermodynamics and kinetics, with multimedia content and interactive exercises.
ORCA Forum
The official user forum for the ORCA quantum chemistry program, run by its developers at the Max Planck Institute for Coal Research. Search it to troubleshoot input files, convergence failures, and method choices in real calculations.
Psi4 Documentation
The reference manual for Psi4, an open-source quantum chemistry package. It documents input syntax, available methods from Hartree-Fock through coupled cluster, and the Python API, so you can set up and interpret your own electronic structure calculations.
Analytical Chemistry
A textbook covering the core of quantitative analysis: gravimetric and volumetric methods, acid-base and redox equilibria, electrochemistry, spectroscopy, and chromatographic separations. Working through it you can select an appropriate analytical method and evaluate the error in a measurement.