ChemSpider is a chemical structure database that provides access to structures, properties, and associated information. It is owned by the Royal Society of Chemistry.

Reaxys contains Web-based access to CrossFire Beilstein, Gmelin and Patent Chemistry databases.

SciFinder is the online version of Chemical Abstracts, and provides access to information on substances, reactions, and patent and journal references.

Concurrent user limit: 2 users on the platform
CHEMnetBASE contains an eBook collection that covers various subject areas. It includes several chemical dictionaries, and the CRC handbook of chemistry & physics.

Note: Merck Index is now provided by The Royal Society of Chemistry.
Merck Index Online is an encyclopedia of chemical substances, including human and veterinary drugs, biologicals and natural products.