Chemical Abstracts Service (CAS)  
   World's largest and most comprehensive chemical database with over 21 million document records and 37 million substances listed.
   http://www.cas.org/

Chemcyclopedia Plus  
   An annual supplement to Chemical & Engineering News (C&EN). Provides users/purchasers of chemicals with trade names, packaging, special shipping requirements, potential applications, and CAS Registry Numbers. Chemicals are listed in categories.
   http://pubs.acs.org/chemcy/

Agency for Toxic Substances and Disease Registry  
   Searchable database for publications and resources about the effect of hazardous substances on public health and the environment.
   http://www.atsdr.cdc.gov/search

Database Searching at Liverpool  
   Chemistry Literature Searching (BIDS ISI, ISIS, Camb Struc Data, Beilstein, journals).
   http://www.liv.ac.uk/Chemistry/Library/DatabaseSearching.html

SPECS and BioSPECS B.V.  
   Provider of chemical compound library's for HTS in vials or plates.
   http://www.specs.net

JAICI  
   JAICI is a not-for-profit scientific information service organization featuring, in particular, chemical expertise.
   http://www.jaici.or.jp/english/index_e.htm

MDLI Information Systems  
   Provider of chemical structural databases and information management software to the chemical, agrochemical, and pharmaceutical industry.
   http://www.mdli.com

Hazardous Chemical Database  
   Contains names, formulas and registry numbers for 1991 hazardous chemicals. This site was last updated in 1996.
   http://ull.chemistry.uakron.edu/erd/

NIST Chemistry WebBook  
   Database of organic chemistry compounds, organized by species. Contains chemical and physical property data on over 30,000 compounds.
   http://webbook.nist.gov/chemistry/

The ChemExper Chemicals Directory  
   A catalog of 60000 fine chemicals searchable for free using a chemist-friendly search engine. Products are listed with physical data including IR spectra and MSDS. Contributions to the database possible with dedicated (and free) program.
   http://www.chemexper.com/

RADEN Data Bank  
   Is designed for compilation of experimental researches and calculations of the RADiative and ENergy parameters defining the distribution of intensity in electronic and vibrational spectra of diatomic molecules.
   http://www.chem.msu.ru/homes/raden/index.htm

FTIRsearch.com  
   Search a database of 87,000 FTIR and Raman spectra using text or full spectral comparison. JAVA required.
   http://ftirsearch.com

Fydat - Physical Property Database  
   Point properties and thermodynamic and transport properties of over 500 common organic compounds and gases. Program calculates mixture properties. Demo version available.
   http://home.worldonline.cz/~cz050233/indexe.html

Indiana University Molecular Structure Center  
   Small molecule database of structures that have primarily been determined using single crystal X-ray diffraction. Features JAVA applets that can be used to orient and examine the molecule, and a dedicated Beowulf computer system to generate high quality
   http://www.iumsc.indiana.edu

Risk Management Internet Services - Chemical Databases  
   MSDS, toxicology profiles, chemical health hazards, chemical labeling requirements, TLVs, government lists of hazardous substances, pesticide information, storage compatibility, and chemical safety guides. Use of site requires paid subscription.
   http://www.rmis.com/db/dbchemicals.htm

Analytical Science and Instruments Limited  
   Providing information to the scientific community on all aspects of the analytical sciences in education, chemical suppliers, consultancies, instrumentation and research.
   http://www.analytical-science.com

Nanogen Index 2  
   Offers a book containing data on over 3000 pesticides and other environmental contaminants.
   http://www.nanogens.co.uk/

Derwent Information  
   Chemical, pharmaceutical and biotechnological databases, covering patents, journals and conferences.
   http://www.derwent.com/chemistry/

CCINFOweb  
   Web access to health and safety databases covering over 185000 chemical substances. Provided by Canadian Centre for Occupational Health (CCOHS). Free access to CHEMINFO database.
   http://ccinfoweb.ccohs.ca/aboutCCINFOweb.html

IUPAC Compendium of Chemical Terminology  
   Also known as the IUPAC Gold Book. Searchable database of nearly 7000 IUPAC-approved definitions of chemical terms. IUPAC - The International Union of Pure and Applied Chemistry.
   http://www.chemsoc.org/goldbook

CML Reference Collection  
   Commercial database of more than 120,000 3D molecular structures expressed in CML (Chemical Markup Language) format.
   http://www.randomfactory.com/cml.html

DETHERM Thermophysical Properties  
   Thermophysical properties of pure substances and mixtures. Phase equilibrium data, caloric data, critical data, transport properties, electrolyte data. Data sets with descriptors and bibliographic references.
   http://i-systems.dechema.de/detherm

Chemical Kinetics and Thermochemistry Database for High-Temperature Materials Synthesis  
   Free database containing thermochemistry data for over 400 compounds relevant to high-temperature processes used in materials synthesis. Searching by molecular formula.
   http://www.ca.sandia.gov/crf/03_collaboratories/ThermoKinData/index.html

ChemIDplus  
   A free database of 350000 chemical compounds. Records consist of name, synonyms, CAS number, molecular formula, and direct links to biomedical resources. Included also over 100000 structures. Searchable by substructure with free Chime plugin.
   http://chem.sis.nlm.nih.gov/chemidplus/

NCI-3D Database  
   A free database of more than 120000 substances with 2D and 3D information compiled from the National Cancer Institute. Searchable by substructure with free Chime plugin.
   http://chem.sis.nlm.nih.gov/nci3d/

WebReactions - Organic Reaction Retrieval System  
   Free reaction search system offering direct retrieval of reaction precedents. Search based on reaction types and bonding change.
   http://webreactions.net

SOLV-DB  
   A free database of commercially available solvents searchable by many properties. Compiled by National Center for Manufacturing Sciences.
   http://solvdb.ncms.org/

Chem Sources-Online  
   Supplier information for approximately 200000 chemical compounds. Searching for compounds is free, the supplier information is fee based.
   http://www.chemsources.com/chemonline.html

DDBST - Dortmund Data Bank and DDB Software Package  
   Database of thermodynamic and transport properties of pure components and mixtures for use in process design and development and related software package.
   http://www.ddbst.de

ChemExpo  
   News, stock reports, products, directories, classifieds, and profiles of commercially available chemical products; focus reports;
   http://www.chemexpo.com

LiqCryst - Online  
   Information about approximately 75000 compounds with liquid crystalline properties. Compound search is free, the compound data are fee based.
   http://liqcryst.chemie.uni-hamburg.de/lc/fc_lolas_e.html

SPRESIweb - InfoChem GmbH  
   The new SpresiWeb developed by InfoChem is an integrated scientific database containing over 4.5 million molecules, 3.5 million reactions, 380,000 references, 98,000 patents covering years 1974 - 1999.
   http://www.infochem.de

Abstract Database from Rapra  
   Subscription based online library providing information to rubber, plastic, and polymer industries.
   http://abstracts.rapra.net/

Engineering Chemistry Databases  
   The largest numeric database system in China for chemical, petrochemical, metallurgical industries. Provides experimental data, reference information. Can also perform data estimation.
   http://159.226.63.177/

Structure Database of Chemicals with Pharmaceutical Activity  
   Animations require the Chime plug-in to view. From Oxford University, UK.
   http://www.chem.ox.ac.uk/mom/chemical-database/

Acronym and Abbreviations Database  
   About 13000 acronyms and abbreviations related to chemistry.
   http://www.oscar.chem.indiana.edu/cfdocs/libchem/acronyms/acronymsearch.html

MALDI Database from NIST Polymers Division  
   Database of methods, taken largely from the peer-review scientific literature, for matrix-assisted laser desorption ionization (MALDI) mass spectrometry of synthetic polymers.
   http://polymers.msel.nist.gov/maldirecipes/

ChemBank  
   Initiative for Chemical Genetics. Freely available collection of data about small molecules (over 2000 compounds) and resources for studying their properties, especially their effects on biology.
   http://chembank.med.harvard.edu/

The IVC-SEP Data Bank for Electrolyte Solutions  
   Contains more than 100,000 experimental points concerning the phase behavior and the thermal properties of aqueous solutions containing electrolytes and/or non-electrolytes.
   http://www.ivc-sep.kt.dtu.dk/databank/databank.asp

Polymer Database PoLyInfo  
   Provides free access to data required in polymeric material design - structures, names, and properties of monomers and polymers, polymerization information.
   http://polymer.nims.go.jp/polyinfo_top_eng.htm

Synthesis Reviews Database  
   Free database of more than 16000 references to English review articles (from journals and books) of interest to synthetic organic chemists.
   http://www.thieme-chemistry.com/thieme-chemistry/journals/info/freedata/index.shtml

ChemBank - Small Molecule Bioactives Database  
   Chemical structures and biological activity data for over 2,000 compounds, primarily from published sources.
   http://chembank.med.harvard.edu/bioactives/

CHEMnetBASE  
   Online access to major chemical reference works from Chapman & Hall/CRC including Combined Chemical Dictionary (CCD), The Handbook of Chemistry & Physics, Polymers: A Property Database, Properties of Organic Compounds.
   http://chemnetbase.com

Synthetic Pages  
   Free interactive database of practical and reliable organic, organometallic and inorganic chemical syntheses submitted by synthetic chemists.
   http://www.syntheticpages.org/

IUPAC-NIST Solubility Data Series Database  
   Comprising 11 volumes from the IUPAC Solubility Data Series liquids with liquids. A limited number of multi-component (organic-water-salt) systems are also included.
   http://srdata.nist.gov/solubility

IRSLDB-Infrared and Raman Spectroscopy Literature Database  
   Bibliography of infrared and Raman spectroscopy and its applications. Provides reference data (title, author(s), journal, page, date info.) collected from 123 journals, grouped into 129 classes.
   http://www.elsevier.com/pub/6/9/show/

DIPPR (Design Institute for Physical Property Data) Project 801  
   Compilation of reliable physical, thermodynamic, and transport properties for 1,793 industrially important chemical compounds with 44 properties. The database is sponsored by AIChE.
   http://dippr.byu.edu

OSHA Search Page  
   Database of documents produced by Occupational Safety and Health Administration, including analytical methods and chemical sampling information.
   http://www.osha.gov/pls/oshaweb/owasrch.full_site_search

Organic Syntheses  
   Describes checked and edited experimental procedures, spanning a broad range of synthetic methodologies. CrossRef(R) and Chemport(R) enabled reference linking.
   http://www.interscience.wiley.com/db/os

Organic Reactions on Wiley InterScience  
   Comprehensive database of important synthetic reactions, with all published examples of the topic reactions.
   http://www.interscience.wiley.com/db/or

Chemfinder Chemical Directory  
   Directory of chemicals, physical properties, and Internet links.
   http://chemfinder.cambridgesoft.com/

Wiley Database of Polymer Properties  
   Physical property data for polymers commercially available, with experimentally determined and selected data for over 2,500 polymers. Derived from the Polymer Handbook.
   http://www.interscience.wiley.com/db/wdpp

Organic Synthesis series  
   All annual volumes of Organic Syntheses in ISIS/Base format. Checked and edited experimental synthetic procedures.
   http://www.exchemistry.com/orgsyntheses.html

ESIS: European chemical Substances Information System  
   Provides information on chemicals, related to: EINECS, ELINCS, HPVCs & LPVCs, Classification and Labeling, IUCLID Chemical Data Sheets, Risk Assessment.
   http://ecb.jrc.it/esis/

Spectra databases for analytical laboratories  
   ATR, FT IR, and Raman Spectra of chemicals and other compounds. Includes polymers, solvents, forensics, etc.
   http://www.stjapan.de

ZINC  
   Free database of over 2.7 million commercially-available compounds for virtual screening in ready-to-dock, 3D format.
   http://zinc.docking.org

EuroSpec  
   International spectroscopic data bank and archive project for spectroscopic and associated data, from peer reviewed publications, with link to the chemical abstracts register.
   http://www.is-db.org/eurospec/