Google
http://www.google.com

Yahoo
http://www.yahoo.com/

Metacrawler
http://www.metacrawler.com/

Dogpile
http://dogpile.com/

Altavista
http://www.altavista.com/

Open Directory Project
http://dmoz.org/

Looksmart
http://search.looksmart.com/

AllTheWeb
http://alltheweb.com/

Hotbot
http://www.hotbot.com/

Excite
http://excite.com/

Lycos
http://lycos.com/

Beaucoup!
http://beaucoup.com/

Wisenut
http://wisenut.com/