All Purpose Search Engines and Directories

Yahoo
HotBot

Google

Search
All the Web Lycos
Alta Vista Beaucoup
Go.com Clusty
Ask Web Crawler
Meta Crawler iTools
Soople  

Specialized Search Engines

Vivisimo

Compiles and presents "clustered results" -categorized groupings organized by comceptually related topics

Surf Wax

Displays the source of the search results, as well as a "Result Summary".

Dogpile

"Fetches" the best results from the best search engines and allows you to refine the results in clusters.

KartOO

Maps relationships and refines ideas

Web Brain

Search the web to explore a dynamic picture of related information

Virtual Learning Resource Center

Find authorative "hits" by searching quality general information sites. Allows for a more focused search by selecting subject area.

Mooter

Clusters results.

Search the Invisible Web

Librarians' Index An indexed list of trusted websites.
Academic Info A subject directory of over 25,000 educational resources for high school and college students.
Infomine INFOMINE is a virtual library of Internet resources relevant to faculty, students, and research staff at the university level. It contains useful Internet resources such as databases, electronic journals, electronic books, bulletin boards, mailing lists, online library card catalogs, articles, directories of researchers, and many other types of information.
IncyWincy An invisible web search engine
Complete Plant Over 700,000 searchable databases and specialty search engines.