Free Databases (all subjects): Chemistry

CambridgeSoft allows free searching of its chemical information. You can find physical properties and spectra for many chemicals.

ChemWeb.com members can access over 350 journals and 15 databases from a variety of publishers. A number of databases offer structure-based searching and manipulation of molecular structures. Subjects covered include: analytical chemistry, biochemistry, catalysis, chemical engineering, electrochemistry, fuel & petrochemistry, inorganic chemistry, materials chemistry, organic chemistry, pharmaceutical science, physical chemistry, and polymer science. The site also includes career information and

Includes free access to chemical, spectral, and thermophysical data on thousands of chemical compounds. Users can search the database by formula, name, CAS number, reaction, author, or structure.