Directorios genéricos

Yahoo!
http://www.yahoo.com
http://www.yahoo.es

LookSmart
http://www.looksmart.com

OpenDirectory Project
http://www.dmoz.org

About
http://www.about.com

Motores genéricos

Altavista
http://www.altavista.com

Dogpile
http://www.dogpile.com

Google
http://www.google.com

HotBot
http://www.hotbot.com

Metacrawler
http://www.metacrawler.com

Northern Light
http://www.northernlight.com

Agentes

BookWhere
http://www.bookwhere.com

BullsEye Pro
http://www.intelliseek.com

Copernic 2001 Basic, Plus y Pro
http://www.copernic.com

WebSeeker 5
http://www.bluesquirrel.com/

WebFerret
http://www.ferretsoft.com

Web profundo

Internet Invisible
http://www.internetinvisible.com/

InfoMine
http://lib-www.ucr.edu/

InvisibleWeb
http://www.invisibleweb.com/

Directorios y motores temáticos especializados

Librarian Indexing to the Internet
http://lii.org

SOSIG
http://www.sosig.ac.uk

Humbul
http://www.humbul.ac.uk

BUBL
http://bubl.ac.uk

Scirus
http://www.scirus.com

Search4Science
http://www.search4science.com