National Center for Biotechnology Information (NCBI), A collection of public databases for research in computational biology, genome data, and biomedical information. Use the menu on the website to pick your topic and then pick the tab for databases. Resources include the GeneBank, Entrez, MyNCBI, PubMed, Entrez Gene, BLAST, BLAST Link (BLink), Electronic PCR, UniGene, HomoloGene, ProtEST, Cancer Chromosomes, Entrez Genomes, and many others.
FDA: Bioinformatics Tools, List of tools for working with datasets
OBRC: Online Bioinformatics Resources Collection, created and maintained by the University of Pittsburgh Health Sciences Library System, contains brief descriptions of and links for more than 2,400 bioinformatics databases and tools.
Broad Institute of Harvard and MIT, The Broad Institute has developed and made freely available many software tools for the analysis of large genome-related data sets.
European Bioinformatics Institute (EBI) part of the European Molecular Biology Laboratory (EMBL), a non-profit, intergovernmental organization funded by 22 member states and two associate member states.
ExPASy is the SIB Bioinformatics Resource Portal which provides access to scientific databases and software tools in different areas of life sciences including proteomics, genomics, phylogeny, systems biology, population genetics, transcriptomics etc.