Searchable by name, formula, MW, CAS number and substructure.
NIST Chemistry WebBook
Provides chemical and physical property data on over 10,000 compounds.
Free and public distributed database of molecular structures analyzed by crystallography labs across the world.
Molecular Logic Database (MOLO)
Designed to provide teachers and students with easy access to model-based activities that focus on rule-based genetics and the interactions of atoms and molecules.