ASTM Directory
- Containing links to scientific and technical consultants' e-mail and websites.
- http://www.astm.org/cgi-bin/SoftCart.exe/CONSULTANTS/search.html?L+mystore+myqy1580

Institute of Transportation Engineers
- Database of experts in traffic, road design, and accident reconstruction.
- http://www.ite.org/directories/expert.asp

American Institute of Chemical Engineers
- Searchable database of chemical engineering consultants and experts.
- http://develop.aiche.org/careerengineer/

IEEE-USA Consultants Database
- Database of consultants and experts in electrical, electronics, and computer-related fields.
- http://www.ieeeusa.org/business/consultants/cgi-bin/consultant.cgi

Earth's Environmental Experts (3E).
- Database of environmental experts and consultants, available to subscribers. Also offering a free trial.
- http://www.3eltd.com/