- Bielefeld Academic Search Engine - Search Engine of multidisciplinary academic resources developed by the Library of the University of Bielefeld in Germany. Query interface available in German and English with advanced search options.
- CiteSeer - Scientific literature digital library and search engine maintained by the College of Information Sciences and Technology at Pennsylvania State University.
- Google Scholar - Google specialized search oriented literature searches. Option of advanced searches by author, publication restriction and dates.
- Google Books - Full-text searches of books. According to the rights to which each is subject text fragments displayed or allows browsing the entire book.
- Google Co-op - Application of Google that allows you to configure a custom to narrow searches to domains that are indicated finder.
- Google News Archive Search - Specialized service oriented search Google news archives. Advanced search and date restrictions, publication or fee.
- Scirus - Specialized search engine in science. Covers scientific literature, news, patents, reports, and medical and technical data. Indexes 300 million scientific web sites. The algorithm uses values the position and frequency of the terms in the text and the input links to the page.
- UNESCO Thesaurus - The UNESCO Thesaurus is a controlled and structured list of terms used in subject analysis and search for documents and publications in the fields of education, culture, natural sciences, social and human sciences, communication and information list.
- Academic Info - Educational Resources Thematic Directory maintained by the University of Phoenix.
- WWW Virtual Library - The oldest and reputed thematic catalog of the Web, started by Tim Berners-Lee himself at CERN in Geneva in 1991.
- Directory of Open Access Journals - Directory of scientific journals with editorial control by peer review offered in the form of open access. Search by word, by title and by subject.
- Electronic Resources - Catalog, electronic resources organized by the Library of the University of California Berkeley. Browse by subject or resource type and word search, bounded to the title or description of the resource.
- Infomine - Virtual library of Internet resources maintained by the Library of the University of California Riverside. Search by resource type, by theme and words.
- Intute - Books online resource for education and research developed by a consortium of British universities. Search by words and by subject area (Science and Technology, Arts and Humanities, Social Sciences and Health and Life Sciences).
- Latin American Network Information Center - Based at the University of Texas at Austin is the oldest and largest online directory dedicated to information on Latin America.
- Librarian's Internet Index - One of the oldest and most prestigious network indices. Collects manually "web sites that can be trusted."
- High Wire Press - A service of the University Library Stanford indexes content from over a thousand scientific journals with editorial control pairs. Advanced searches and alerting. Contains an index that allows the exploration of resources in terms of their conditions of use.
- IMDB - The Internet Movie Data Base is a comprehensive online database devoted to film, television and video games. Searchable by titles, names, characters and words in all categories.
- IMSDB - The Internet Movie Script Database, unrelated to the IMDB, is a database of movie scripts can access those in html. Search by words, by genre and titles.
IV) Archives and Libraries
- British Library - The British National Library is one of the largest in the world.
- Library of Congress - The U.S. National Library is the first character federal cultural institution in the United States and is the largest library in the world. The LOC website has a section specifically aimed at researchers with a wide range of resources.
a) Other virtual libraries and codes of free educational materials
- Academic Commons - Academic community driven Center of Inquiry in the Liberal Arts from Wabash College dedicated to developing and promoting open for teaching the liberal arts web resources.
- Footnote - Photo Exhibit in line with social web services. Allows you to search, receive and record historical documents, create personal pages, and share resources.
- OpenCourseWare - Portal of MIT courses offered as free and open educational resource for students and teachers around the world form.
- Open Educational Resources - Internet Archive Section offered in a wide range of educational materials for students and teachers at all levels, under the premise of universal access to human knowledge.
- Project Gutenberg - It is the oldest digital library network. A vast project developed by oriented digitize, archive and distribute scanned books volunteers whose texts are in the public domain.
- SciELO - The Scientific Electronic Library Online is an electronic library that publishes scientific journals and indexes
- World Lecture Hall - Free online access to academic teaching materials. Advanced search and browsing subject categories. Maintained by the Center for Instructional Technologies at the University of Texas at Austin.
- b) Audiovisual Archives
- Archives Pour Tous - Archive of radio and television programs operated by the French Institut National de l'Audiovisual.
- Moving Images Archive - Internet Archive section that includes various thematic collections of film and video.
- Motion Picture & Television Reading Room - Access to funding film and television archive of the Library of Congress.
V) Monitoring trends and creating alerts
- Google Alerts - Service emails that can be configured for announcements of new results related to your search terms determined by the user, both on the Web and News (from Google News) or by combining both approaches. Sets the frequency of the ads (once a day, once a week or when the reference occurs).
- BlogPulse - Monitoring and graphical representation of trends in the blogosphere. Generates RSS feeds of search results.
- IceRocket - Differentiated Search through blogs, websites, news and pictures. Tool comparative representation of trends between terms and undecideable by date.
- ISI Web of Knowledge - Essential to generate alerts literature reviews, research agenda and academic appointments reference.
- Technorati - Reference search social web. Advanced search for words and bounded by media, tags, dates, or tongue. Index Most Popular Searches and music videos and news linked. Generates RSS feeds of search results.
VI) Social Bookmarks
- CiteULike - Manager online academic articles. Allows creation of a personal library to retain references of texts of interest detected on the network and export records to tools such as BibTeX and Endnote.
- Connotea - Manager online academic references. Lets discover, share and organize references online. Sheets exportable in RIS format.
- Delicious - Lets discover, publish, share and annotate links (bookmarks or favorites) and RSS subscribe to search results via labels sources.
- H2O Playlist - A tool developed by the Berkman Center for Internet & Society at Harvard Law School that allows the creation of online collections of multimedia resources. Especially useful for the management of learning materials to support classes.
- Library Thing - Tool to maintain and share online book catalogs. Benefits of social network. Free service up to 200 entries.
- Zotero - Extension for the Firefox browser that enables you to collect, manage and share academic resources
- Citizendium - Project driven by Larry Sanger, one of the founders of Wikipedia, aimed at launching an online encyclopedia written collaboratively by authoritative sources.
- Wikibooks - A collection of textbooks free content. Project of the Wikimedia Foundation.
- Wikiversity - A free and free to create online learning projects and development of educational content educational platform. Project of the Wikimedia Foundation.
VIII) Editing and hosting Weblogs
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