[NOTE from May 2015: Recent information from Physicians Committee: Animal Testing and Alternatives]
These are selected companies (as of January 2008) perhaps of particular interest for their potential to replace and significantly reduce animal drug testing. Many other companies can be found by searching individual company types on Google or other search engine. This is also a work in progress.
Human cells and tissues (including microarrays)
Bioinformatics and In Silico Methods