Meta-pesquisa

• CataList - the catalog of LISTSERV® lists

• Groups Google

• Groups MSN

• Scirus - Scientific Information

• Google Scholar

• Tumba - pesquisa na web Portuguesa

• Search.com

• Ditto - Visual Search Engine

• FotoSearch - Arquivos de Fotografia

• All Things Photo - Photography & Digital Imaging

• Search Edu - 20 million university and education pages indexed and ranked in order of popularity

• Karnak - Offline web Search

• Softcrawler - Metasearch for Soft-, Free- und Shareware

• Search in the Net

• Beaucoup: Search Engines

• Info.com (12 search engines)

• IXQuick - MetaSearch

• FAST - All the Web MetaSearch

• Infomine - Scholarly Internet Resource Collections

Enciclopédias e Conhecimento

• Encarta

• Britannica

• Columbia Encyclopedia

• TechTarget

• TechEncyclopedia

• BitPipe

• Webopaedia: online dictionary and search engine for computer and Internet technology

• OneLook Search dictionary web sites for words and phrases.

• YourDictionary

• FolDoc - Free Online Dictionary of Computing

• WhatIs?com

Bibliotecas

• Biblioteca Nacional
• Bibliotecas da Universidade do Minho
• Bibliotecas da Universidade de Aveiro
• Associação Portuguesa de Bibliotecários, Arquivistas e Documentalistas
• Biblioteca do Congresso Americano | Library of Congress (USA)
• British Library
• British Library Public Catalogue
• Grainger Engineering Library Information Center
• HighBeam Research (former The Electric Library)
• The Public Library of Science
• The Internet Public Library
• The Internet Archive - Building a Digital Library for the Future
• The WWW Virtual Library: Library Resources by Libraries and Librarians
• Association of Research Libraries

Sistemas de Informação

• NTIS - National Technical Information Services (USA)
• ISI - Institute for Scientific Information
• Emerald Insight
• LUSODOC - Documentação Técnico Científica, Lda

Editores

• Allen Press Inc. | Ashgate Publishing | Aspen Publishers
• Bartleby | Begell House Inc. Publishers | Birkhauser (Springer) | Blackwell Science
• CAB International | Cambridge University Press | Carfax Publishing Limited (Taylor & Francis) | CRC Press
• Elsevier | Emerald
• Garland Science (BIOS Scientific Publishers Ltd) | G.I.T. Verlag  | Gordon and Breach (Taylor and Francis)
• Harwood Academic Publishers (Taylor & Francis) | Harcourt | Haworth Press | Heron Publishing | High Wire Press | Hodder
• Inter-Research
• Kluwer Acad. Publ. (Springer)
• Lavoisier | Lippincott Williams & Wilkins
• MacMillan Publishers | Marcel Dekker, Inc.'s | Mary Ann Liebert, Inc. | MCB University Press | McGraw-Hill | McGraw-Hill Higher Education | M.I.T. Press | Morgan Kaufmann (Elsevier) | Munksgaard (Blackwell)
• National Academy Press
• Oxford University Press
• Pearson Education | Portland Press | Prentice-Hall
• Routledge (Taylor & Francis)
• Science Publishers | Spon | Springer | Swets & Zeitlinger B.V
• Taylor & Francis | Thomson Publishing | Trans Tech Publications Ltd & Scitec Publications Ltd
• University of Chicago Press
• Walter de Gruyter & Co. | W.B. Saunders (Elsevier) |  Wiley |  Wiley-VCH |  World Scientific Publishing

Livrarias

• abebooks.com - used, secondhand, rare, out-of-print - finding books just got easier
• Alibris - Books You Thought You'd Never Find - Used, Rare, and Out-of-Print Books
• Amazon
• BookFinder.com Search for New, Out of Print and Used Books