Distributed Structure-Searchable Toxicity Database Network
- DSSTox provides a community forum for publishing standard format, structure-annotated toxicity data files for open public access. Offers search based on chemical formula, maintained by the Environment Protection Agency, USA.
- http://www.epa.gov/nheerl/dsstox/

Acute Toxicity Database
- Statistical approaches for taxonomic comparisons, and factors such as age, pH, temperature, water hardness, and diet affecting toxicological outcome. Maintained by the Columbia Environmental Research Center, Missouri.
- http://www.cerc.cr.usgs.gov/data/acute/acute.html

Tetratox
- Database of toxic potency data for more than 2,100 industrial organic compounds maintained by the College of Veterinary Medicine, University of Tennessee, Knoxville.
- http://www.vet.utk.edu/TETRATOX/

Toxicology sites
- Toxicology sites maintained by Dr. Hardin, at University of Iowa.
- http://www.lib.uiowa.edu/hardin/md/tox.html

Toxicology and Environmental Health Information
- Databases and resources related to toxicity, hazardous chemicals and ecological hazards, at National Library of Medicine, Bethesda, Maryland.
- http://www.sis.nlm.nih.gov/Tox/ToxMain.html