ATCC

American Tissue Culture Company
Cell Cultures, bacterial and viral strains

http://www.atcc.org/

CLDB

This site provides access to the Cell Line Data Base via HyperCLDB; comprehensive listing of cell lines making use of data contents of ATCC and DSMZ

http://www.biotech.ist.unige.it/cldb/indexes.html

DSMZ

Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH/ German Collection of Microorganisms and Cell Cultures
Bacteria, Archaea, fungi, plasmids, phages, human and animal cell lines, plant cell cultures and plant viruses

http://www.dsmz.de/