Cambridge Structural Database (WebCSD)
Repository for small-molecule organic and metal-organic crystal structures.

CHEMnetBASE
Chemical reference works.

CRC Handbook of Chemistry and Physics
Authoritative resource consisting of tables of data and current international recommendations on nomenclature, symbols, and units.

Lange's Handbook of Chemistry
Standard reference for chemists covering facts, data, and tabular material.

MarinLit
Comprehensive coverage of marine natural products in journal articles, including new and revised compounds, synthesis, ecology and biological activities.

Reaxys
Use this database to locate chemical substances and reactions.

Science of Synthesis
Reviews of organic and organometallic transformations as well as experimental procedures.

SciFinder
Comprehensive article database of the chemical literature.

Web of Science
Article database covering major scientific publications and cited references.