1. Deep Web Search Engine — Clusty.
2. Art — Musie du Louvre.
3. Books Online — The Online Books Page.
4. Business — Explorit Now!.
5. Consumer — US Consumer Products Safety Commission Recalled Products.
6. Economic and Job Data — FreeLunc.com — A searchable directory of free economic data.
7. Finance and Investing — Bankrate.com.
8. General Research — GPO's Catalog of US Government Publications.
9. Government Data — Copyright Records (LOCIS).
10. International — International Data Base (IDB).
11. Law and Politics — THOMAS (Library of Congress).
12. Library of Congress — Library of Congress.
13. Medical and Health — PubMed.
14. Science — ScienceResearch.com.
15. Transportation — FAA Flight Delay Information