I never heard about these and I'll post soon on all the below:
DDBJ, EMBL, GenBank,Ensembl,Uniprot,Swiss-prot
DDBJ is Japanese DNA Data Bank.
EMBL is Europe's primary nucleotide sequence resource
GenBank is the NIH genetic sequence database, an annotated collection of all publicly available DNA sequences
Ensembl: The Ensembl project produces genome databases for vertebrates and other eukaryotic species
Uniprot: Universal Protein Resource
Swiss-Prot is the manually annotated and reviewed section of the UniProt Knowledgebase (UniProtKB)