Search engines
AltaVista ● Ask Jeeves ● BPubs ● Dogpile ● Excite  ●  FindLaw ● FirstGov ● Google ● HotBot ● Infoseek
IxQuick ● LookSmart ● Lycos ● Mamma ● MetaCrawler  ● Profusion ● PsychCrawler ● Vivisimo
Webcrawler ● WiseNut ● Yahoo!

Encyclopedias
AccessScience ● Encyclopedia Americana ● Encyclopedia.com ● Looksmart-Encyclopedias ● How Stuff Works
Oxford English Dictionary