C. albicans physical map – Candida albicans server at the Univ. of Minnesota
C. albicans UniProtKB/Swiss-Prot entries, gene names and WWW servers
C.caldarium – Cyanidium caldarium strain RK1 chloroplast genome
C.difficile – Clostridium difficile strain 630 genome project at Sanger Institute
C.diphtheriae – Corynebacterium diphtheriae strain NCTC 13129 genome project at Sanger Institute
C.elegans UniProtKB/Swiss-Prot entries, gene names and cross-references to WormPep
C.elegans WWW server – at University of Texas Southwestern
C.jejuni – Campylobacter jejuni genome project
C.michiganensis Claviabacter michiganensis subsp. sepdonicus genome project at Sanger Institute
C.muridarum – Chlamydia muridarum strain MoPn genome Database at JCVI-CMR
C.pneumoniae AR39 – Chlamydia pneumoniae strain AR39 genome Database at JCVI-CMR
C.pneumoniae J138 – Chlamydia pneumoniae strain J138 genome Database at JCVI-CMR
Caesar Software LLC
Candida albicans pages – Candida albicans at the NRC/BRI
CandidaDatabase – Candida albicans GenoList browser at Institut Pasteur
Caprion Proteomics, Inc.
Carbohydrates resources
Carbohydrates – IUPAC-IUBMB nomenclature for carbohydrates
Carbosynth – offering 2500 carbohydrates and nucleosides
CATH – UCL BSM structural classification of proteins
CAZy – Carbohydrate-Active enZYmes Web site
CBI – Peking Center of Bioinformatics; Chinese EMBnet node
CBIL – Computational Biology and Informatics Laboratory at the University of Pennsylvania
CBRG – Computational Biochemistry Research Group (Zurich / Switzerland)
CBS domain – Cystathionine Beta Synthase domain
CBS – CBS Genome Atlas Database
CBS – Center for Biological Sequence Analysis (Technical University of Denmark)
CC_DatabaseMD The Congenital Cataract Mutation Database
CCB – Centre for Computational Biology at the Hospital for sick children
CCB – Washington University Center for Computational Biology
CCDC – Cambridge Crystallographic Data Center (Cambridge Structural Database (CSD))
CD antigens entries and nomenclature in UniProtKB/Swiss-Prot
CD3Ebase – Human CD3E mutation Database
CD3Gbase – Human CD3G mutation Database
CD40Lbase – Human CD40 ligand mutation Database
Celera
Cell Press
Cell Therapy News
Celldex Therapeutics – antibody-based combination immunotherapy company
Cellectis SA – Genome Engineering
CellZome
Centocor Ortho Biotech, Inc.
CFTR mutation – Human cystic fibrosis mutation Database (CFTR)
CGAP – Cancer Genome Anatomy Project
CGD – Candida Genome Database
ChemSynthesis – Chemical Database
ChlamyDatabase – Chlamydomonas reinhardtii genome Database
Chr1 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr10 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr11 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr12 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr13 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr14 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr15 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr16 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr17 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr18 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr19 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr2 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr20 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr21 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr22 at HGC – Human genome center for chromosome 22
Chr22 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr3 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr4 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr5 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr6 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr7 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr8 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chr9 UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Chromobacterium violaceum – Brazilian Genome
ChrX UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
ChrY UniProtKB/Swiss-Prot – entries, gene names and cross-references to MIM
Churchill Livingstone – has joined the Elsevier Group
CJP – Carden Jennings Publishing Co. Ltd
CL!Psci Scientific Search Engine
Claricode – Expert Medical Software Development
Classification and entries of peptidases in UniProtKB/Swiss-Prot
Classification and entries of restriction enzymes/methylases in UniProtKB/Swiss-Prot
CLC bio – Provider of bioinformatics consulting, software and hardware
CLC Free Workbench – A desktop program including a number of algorithms for DNA, RNA, and protein analyses. Available for Linux, MacOS X and Windows
CLC Protein Workbench – A desktop program including a number of advanced algorithms for protein sequence analysis. Available for Linux, MacOS X and Windows
CleanEx 
Clinical Data, Inc.
CLL Pharma
Clontech Laboratories, Inc.
CluSTr – Automatic classification of UniProtKB proteins into groups of related proteins
CMBI – Center for Molecular and Biomolecular Bioinformatics; Netherland EMBnet node
CMR – TIGR Comprehensive Microbial Resource
CNB – National Biotechnology Center; Spain EMBnet node
CNN Sci-Tech – CNN Science and Technology
COB – The Company of Biologists Ltd
Codon Usage Database
CodonCode Aligner – Sequence assembly and alignment
CodonCode Corporation – Software for DNA sequencing
CoffeeDNA – Coffee genomics web site
COG and KOG – Phylogenetic classification of proteins encoded in complete genomes
COL1/3 mutation – Human Type I and III collagen mutation Database
Cold Spring Harbor Protocols
Colibri – E.coli GenoList browser at Institut Pasteur
Comparison of the transport capabilities of bacterial genomes – from Ian Paulsen
Compugen [USA | Israel]
Computational Genetics Laboratory – Multifactor Dimensionality Reduction (MDR) open source software
Cone shells Web site
ConeServer
Connexin-deafness – Human connexins mutation Database
Contribution of the Sanger Centre to chromosomes 1,6,9,10,11,13,20,22 and X
Cooper Pharma Ltd
COPE – Cytokines On-line Pathfinder Encyclopedia
CottonDatabase – Cotton genome Database
Coxiella burnetii strain RSA 493 UniProtKB/Swiss-Prot entries, gene names and WWW servers
cpnDatabase – A Chaperonin Database
CRC Press Online
Cryptococcus neoformans Genome Project
CSBMCB – Canadian Society of Biochemistry and Molecular and Cell Biology
CSC BioBox – Resources for Bioscientists
CSDatabasease – Cold shock domain Database
CSHL Press – Cold Spring Harbor Laboratory Press
CSIRO – CSIRO Publishing
CSL Ltd
CST – Cell Signalling Technology
CUBIC – Columbia University Bioinformatics Center / RostLab
CUP – Cambridge University Press
CyanoBase – The Genome Database for Cyanobacteria
CyanoList – Synechocystis PCC6803 and Anabaena PCC7120 GenoList browser at Institut Pasteur
CYGD – MIPS Comprehensive Yeast Genome Database
Cytochrome P450 alleles nomenclature
Cytos Biotechnology
Database of Grants-in-Aid for Scientific Research in Japan [in Japanese]
DATAbiotech
DatabaseCFC – Cytokine family Database
DatabaseEST – DatabaseEST (Expressed Sequence Tags) Database (NCBI)
DatabaseSNP – Human single nucleotide polymorphism (SNP) Database
DatabaseSTS – DatabaseSTS (Sequence Tagged Sites) Database (NCBI)
DatabaseTBS – Database of B.subtilis promoters and transcription factors
DCB – Dictionary of cell biology by Julian Dow
DDatabaseJ E.coli – E.coli home page at DDatabaseJ
DDatabaseJ – DNA Data Bank of Japan
deCODE Genetics, Inc.
Delta Mass – Database of mass of Post-Translational Modifications
Dendrome – Forest trees genome Database
Destiny Pharma Ltd.
DFCI GmGI – DFCI Soybean Gene Index
DFCI LeGI – DFCI Tomato Gene Index
DFCI MGI – TIGR Mouse Gene Index
DFCI RGI – TIGR Rat Gene Index
DIC – Bioinformatics Centre at the University of Pune
Dictionaries, protocols, courses, nomenclature, etc.
Dictionary of acronyms
DictyBase – Dictyostelium discoideum Database
DictyDatabase – Dictyostelium discoideum Database
Dictyostelium discoideum UniProtKB/Swiss-Prot entries, gene names and cross-references to DictyBase
Dictyostelium Genome Sequencing project at BCM
Digilab
DIP – Database of Interacting Proteins
DisProt – Database of Protein Disorder
DNA * – DNAStar
DNA Microbiology Guide Online
DNAVision
Do-Coop Technologies Ltd
DOGS – Database of genome sizes
DOI – Digital Object Identifier foundation
DOLOP Database of bacterial lipoproteins
DPD – DNA Patent Database
DPInteract – DNA-Proteins interactions Database
DragonDatabase – Snapdragon Database
DrDatabase – Deinococcus radiodurans strain R1 genome Database at JCVI-CMR
Drosophila UniProtKB/Swiss-Prot entries, gene names and cross-references to FlyBase
Drug Development Technology
Drug Discovery and Development
DrugAlert.org – a  alerting consumers about dangerous drugs
drugdevelopment-technology.com
Drugs.com – a medical reference  for both health professionals and patients
DrugWatch.com – information about medications and drugs currently or previously available
DSDatabaseASE – Disulfide database (derived from 3D data)
DYNACOM Co., Ltd. – Customized and packaged software solutions
E.coli UniProtKB/Swiss-Prot entries, gene names and cross-references to EcoGene
E.ruminantium – Ehrlichia ruminantium (formerly Cowdria ruminantium) genome project at Sanger Institute
easyDNA – DNA testing company
EBI – European Bioinformatics Institute
ECCE – E.coli Cell Envelope Protein Data Collection
ECDC – E.coli Database collection
ECGC – E.coli Genome Center at Wisconsin University
EchoBASE
EcoCyc – Encyclopedia of E.coli genes and metabolism
EcoWeb / EcoGene – Very comprehensive E.coli Database
EFBF – European Federation of Biophysics
EF-hand CaBP – EF-hand calcium-binding proteins data library
EGF – European Genetics Foundation
eggNog – Automated construction and annotation of orthologous groups of genes
EGO – Eukaryotic Gene Orthologs
e-journals.org – Electronic journals directory
Eli Lilly
Elsevier Masson
Elsevier Mosby
Elsevier Science & Technology publishing
EMBL – EMBL Biocomputing unit
EMBL – EMBL Nucleotide sequence Database (EBI)
EMBnet CH 
EMBnet – European Molecular Biology Network
embnet.news – EMBnet’s newsletter
EMBO – European Molecular Biology Organization
Emerald Biosystems – products for crystallography
EMP – Enzymes and Metabolic Pathways Database
EMR Experts, Inc. – electronic medical records
Encyclopedia Britannica and other resources
Encysive Pharmaceuticals
Ensembl Anopheles gambiae genome browser
Ensembl Bovine genome browser
Ensembl C.elegans genome browser
Ensembl Cat genome browser
Ensembl Chicken genome browser
Ensembl Chimpanzee genome browser
Ensembl Compara – Genome-wide species comparisons
Ensembl Dog genome browser
Ensembl Fugu genome browser
Ensembl Gorilla genome browser
Ensembl Horse genome browser
Ensembl Human genome browser
Ensembl Mouse genome browser
Ensembl Pig genome browser
Ensembl Rabbit genome browser
Ensembl Rat genome browser
Ensembl Yeast (S.cerevisiae) genome browser
Ensembl Zebrafish genome browser
Ensembl – Genome database for vertebrates and other eukaryotic species
Entelechon GmbH
Entelos, Inc. – predictive biosimulation
Entries of aminoacyl-tRNA synthetases in UniProtKB/Swiss-Prot
EnviroLogix, Inc. – Test Kits
Enzon Pharmaceuticals, Inc.
Enzyme Directory – An exclusive portal for Enzymes, Substrates, Inhibitors and Recombinant proteins.
ENZYME – Enzymes nomenclature Database
EOL – Encyclopedia of Life
EPD 
ePharmaExpo.com – The virtual trade show for the pharmaceutical industry
EPIMHC – A curated database of MHC ligands
EpoDatabase – Erythropoiesis gene expression Database (Epo GED)
Era7 Bioinformatics
EraGen Biosciences – molecular assays for early detection of diseases
Esbatech – Antibody fragment therapeutics
ESEB – European Society for Evolutionary Biology
ESHG – European Society of Human Genetics
Esp@cenet – Patent information database from the European Patent Office (worldwide coverage)
ESTHER – Esterases and alpha/beta hydrolase enzymes
Estrogen Receptor Resource
Eurofins MediGenomix GmbH
Europe
European Organisation of Family Health Research
Evolva Holding SA – Developing Drugs with Genetic Chemistry
EVOTEC AG
Exclusive Chemistry – design and synthesis of organic compounds
Exelixis Inc.
Expansins web site
ExpressDatabase – Yeast and E.coli RNA expression Database