MolBank, an interesting resource for chemists, "is an electronic journal where very short notes of searchable experimental data records for individual molecules are published." Affiliated with the magazine Molecules and...

From the University of Bristol's School of Chemistry, this site features a new molecule each month. For example, the molecule for April is Melatonin. Each molecule comes with a link to a Webpage from a university or...

For information on thermodynamic data for over 5,000 chemical compounds and on ion-energetics data for over 10,000 chemical compounds, NIST's Chemistry WebBook is available for searching. Compounds can be searched by...

This site from the International Union of Pure and Applied Chemistry contains the nomenclature, description, and diagram of a wide variety of organic compounds.