| Title | Summary | |
| Organic Syntheses(Free) | SummaryPage |
| Search Beilstein Abstracts (formerly known as NetFire) from ChemWeb | SummaryPage |
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| Chemistry databases of Shanghai Institute of Organic Chemistry(Free) | SummaryPage |
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| CASREACT - Chemical Reactions Database | SummaryPage |
| Synthesis Reviews(Free) | SummaryPage |
| SyntheticPages(Free) | SummaryPage |
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| BioCatalysis | SummaryPage |
| BioCyc (a collection of Pathway/Genome Databases) | SummaryPage |
| C1DB: Database of CO+H2 Reaction(Free) | SummaryPage |
| Chemical Database Service (CDS), UK | SummaryPage |
| Chemical Kinetics and Photochemical Data for Stratospheric Modeling(Free) | SummaryPage |
| ChemKey Search Database (Organic Synthetic Method) | SummaryPage |
| ChemRate：A Calculational Data Base for Unimolecular Reaction(Free) | SummaryPage |
| Classic Organic Reactions(Free) | SummaryPage |
| Database of Thermodynamics of Enzyme-Catalyzed Reactions | SummaryPage |
| Delights of Chemistry, University of Leeds | SummaryPage |
| DiscoveryGate | SummaryPage |
| Electronic Encyclopedia of Reagents for Organic Synthesis (e-EROS) | SummaryPage |
| Failed Reactions database | SummaryPage |
| InfoChem GmbH Chemical Structure Search Engine from ChemWeb.com(Partly Free) | SummaryPage |
| Joint Expert Speciation Syetem (JESS)(Free) | SummaryPage |
| Merck Synopsis online(Partly Free) | SummaryPage |
| Methods in Organic Synthesis (MOS) | SummaryPage |
| Monomer Chem's Name Reaction List | SummaryPage |
| Named Organic Reactions Collection from the University of Oxford | SummaryPage |
| NIST Chemical Kinetics Database(Free) | SummaryPage |
| Norgwyn Montgomery Software (molecular modeling and chemical database software) | SummaryPage |
| Protecting Groups | SummaryPage |
| RATE99 (The UMIST Database for Astrochemistry 1999)(Free) | SummaryPage |
| Science of Synthesis and Houben-Weyl(Free) | SummaryPage |
| Science of Synthesis: Houben-Weyl Methods of Molecular Transformation | SummaryPage |
| Searching ChemInform from ChemWeb.com | SummaryPage |
| Searching Reaction Citation Index from ChemWeb.com | SummaryPage |
| Solid-Phase Synthesis database | SummaryPage |
| Sovent Selection DB(Free) | SummaryPage |
| SPRESIweb | SummaryPage |
| The Synthline: Drug Synthesis Database on CD-ROM | SummaryPage |
| WebReactions(Free) | SummaryPage |
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