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Pandia Powersearch 
- List of search engines and directories. Also includes a metasearch engine, search tutorial, and a free newsletter.
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Age of Dot Com - Links to search resources including start pages, integrated search forms, portals, engines, guides, and directories. Offers both a simple links page and a directory with descriptions and ratings.
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Aleph Search - A directory of directories. Links to selected information rich web resources, both unspecialised and specialised, with a strong emphasis on United Kingdom based sites.
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Alt Search Engines - Charles Knight maintains a list of the top 100 alternative and niche search engines. Includes news, reviews and debates on search engines.
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Big Search Engine Index - Directory listing hundreds of search engines, categorized, described and rated.
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Complete Planet - Directory of databases and specialty search engines from Bright Planet.
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CyberTimes Navigator - The starting point that New York Times reporters and editors use for their explorations of the Web. A straightforward list of some of the best sources on the Web for all types of information.
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Direct Search - Gary Price's compilation of links to the search interfaces of resources that contain data not easily or entirely searchable/accessible from general search tools.
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Fetchfido - A graphical interface of links to search engines. Multi-layered, with universal, United Kingdom, United States, European and worldwide sections.
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FinderSeeker - Find the search engine you want by selecting a thematical category and/or country, or search by keyword.
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FTP Search Engines - Rated links to ftp and mp3 search sites.
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Geniusfind - Categorizes thousands of the most useful topic-specific directories and databases, with descriptions.
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Indexing the Internet - An essay by John Hubbard analyzing the question of what is the best way to index the Internet, with references.
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ISEDB - A directory of search engines and directories worldwide, organized by geographical area and subject, includes articles on site submission, marketing, and optimization.
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OpenSearch - A collection of simple formats for the sharing of search results. Includes specifications and frequently asked questions.
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Search Engine Colossus - Directory of hundreds of search engines, organised by country and topic.
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Search Engine Relationship Chart - Bruce Clay's pictorial view of how search engines provide data to partner engines and directories. [PDF]
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Search Engine Showdown - A user's guide to Web searching with features, comparative analysis, strategies, discussion, news and reviews.
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Search Engine Watch - A guide to search engine marketing and search engine optimization. Forums, reviews, articles, ratings, and frequent newsletters. Paying members receive access to extra content.
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Search Engines Worldwide - Search engines sorted by geographical location.
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Search Tools for Web Sites and Intranets - Provides information, news and advice about web site searching technology. Includes a guide, search tools list, glossary, and opportunity to compare searches of its own site by different tools. Offers a free monthly email newsletter.
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Searchenginez - Search forms for the most effective engines in dozens of categories from Robert Skelton. Includes reviews, ratings, webmaster tools, and tutorials.
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Those Dark Hiding Places: The Invisible Web Revealed - Librarian Robert J. Lackie provides annotated links to directories, searchable sites, databases, and search engines useful for uncovering content that the general search engines fail to disclose.
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Topix: Search Engines News - News on the search engine industry continually updated from thousands of sources around the Net.
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