Subcategories:
- Academic Writing (24)
- Dictionaries (14)
- Encyclopedias (5)
- Genealogy (9)
- Maps (4)
- Measurements (4)
- Quotations (10)
- Reference Directories (6)
Reference 
Offers a family-friendly K-12 educational resource about the 50 US states, as well as guides to business, financial, and education products and services, including information on public and private colleges and universities.
http://www.e-referencedesk.com/
Gateway to Development Information. Provides resources on world and third world development, including guides, website directory, documents, email lists, and newsfeeds.
http://www.eldis.org/
Explains how to call any country from the USA, with country codes, area codes, and other useful info.
http://www.howtocallabroad.com/
A French site describing the OCSIMA method for Knowledge Management and Competitive Intelligence.
http://ocsima.neuf.fr/
Online library of the Eindhoven Technology University in the Netherlands. Includes databases, journals, publications, and department libraries. In Dutch and English.
http://www.tue.nl/bib/
Contains a database of firstnames and surnames with the purpose of entertainment, research, or satisfying curiosity.
http://www.namesdir.com/
Archives of declassified government documents made available through the Freedom of Information Act. By The George Washington University.
http://www.gwu.edu/~nsarchiv/
Online reference guide offering almanacs, atlases and maps, dictionary, encyclopedia, legal resources, literay texts and resources, medical and health resources, events that happened on this day, thesaurus, and web directory.
http://www.reference.com/
Statistics on what is the longest of anything. The web address of this site might just be the longest domain name.
http://thelongestlistofthelongeststuffatthelongestdomainnameatlonglast.com/