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Amfibi – General search engine with an uncluttered interface in a choice of Catalan, English, French, and Spanish. Also has a web directory using the Open Directory.

ChaCha – This search engine is a fusion of computer technology and human intelligence. Live human guides are available to provide additional assistance in finding relevant results.
Entireweb – The English-language version of a Swedish search engine with a clean interface and large database. – A cross between a search engine and an encyclopedia. The results return complete, informative sentences about the search topic. Related topics are suggested.
Gigablast – A search engine with a clean interface, advanced search options including sorting by date, and a real time url submission feature. Includes PDF documents in its index.
Lexxe – Processes natural language queries and delivers results in clusters by topic. Queries can be keywords, phrases or short questions.
Live Search – Offers general web search and various verticals, including images, news, classifieds, maps and local. By Microsoft.
Mojeek – Search engine with a simple interface and no advertising. Offers the ability to create a customized topical or personal search index.
Mozdex – Uses open source search technologies and an index seeded from the Open Directory.
Ms. Dewey – Search engine with a touch of humor that plays prerecorded movie clips of a female actress to entertain you while searches are being performed.
Objects Search – An uncluttered interface offers options to search the web, news and blogs, includes cached pages and ‘anchors’, which are titles and descriptions from the Open Directory.
Scrub The Web – Search engine with sponsored links at the top of results. Also offering a meta tag builder and analyzer.
Search 2.0 – Blog dedicated to coverage of the next generation of search engines and new technologies from the original players with tips, tricks, and tutorials on how to search more effectively.
SearchHippo – Indexes sites listed in the major internet directories. Offers free web services, including a search toolbar, and code for webmasters to provide search boxes on their sites.
Searchles, Inc – Offers social search features (allowing others’ opinions to influence your results) and allows users to tag, group and save links.
ThreeMice – Natural-language answer engine, which queries the internet in real time, and will serve up full text from selected sites.
Ulysseek – A straightforward search engine with a simple interface.
Wikipedia: Search Engine – Article in the online collaborative encyclopedia, describing the history and mechanisms of Web search engines.
Wotbox – Search engine with country specific searching. Options to display country flags, and include preview and translation features. Sponsored links appear in panels separate from the main results.

ACM Queue: Why Writing Your Own Search Engine is Hard – Anna Patterson explains the problems of search engine design in practical terms in this lengthy article. (April, 2004)
NPR : The Search Engine Wars – In a five-part series, NPR’s Rick Karr takes a look at the business of search engines. (April, 2004)
Search Engines and Editorial Integrity – Article from the USC Online Journalism Review examines the issue of major search engines adopting deceptive, misleading advertising practices at the expense of editorial integrity and their users. (April 2, 2002)
Commercial Alert Files Complaint Against Search Engines for Deceptive Ads – A complaint filed with the United States Federal Trade Commission by Ralph Nader’s Commercial Alert service, which charges the major search engines of inserting advertisements in search engine results without clear disclosure that the ads are ads. (July 16, 2001)
The Evolution of Web Searching – David Green’s paper from Online Information Review explores the development of search engine technologies.

– Indexes as many as a few million URLs and searches for words and phrases. Uses wildcards and Boolean operators. SWSoft released ASPSeek under the GNU GPL.

Alkaline Search Engine – An Internet/intranet search engine, free for non-commercial sites and available for Windows NT, Linux, Solaris, IRIX, FreeBSDI and BSDI. By Vestris Inc.
ASTAware SearchKey PRO – Indexing, search and retrieval of data residing on Internet and intranet servers, with support for multiple file formats and European languages. Together with ASTAware SearchDisc, offers a solution for simultaneous online and CD searching.
Atrise Everyfind – Design a search engine for your web site, intranet, CD, DVD or any portable documentation.
CareerCast – Develops web-based job and resume search software for career, newspaper and employer sites.
The Clever Project – Incorporates several algorithms that make use of hyperlink structure for discovering information on the Web.
dtSearch – High-volume text search works with many file types. Features include hit highlighting, natural language, fuzzy, phonic, Boolean, proximity, field, numeric range.
Emerge – NCSA Information Technologies’ effort to build a new search infrastructure that addresses issues of scale and heterogeneity.
Estraier – A full-text search engine for Japanese or English text.
F3DSearch – Software to make topic-specific searches by creating and maintaining a hybrid search engine-directory with a link-indexer.
Findmaan – A search engine developed on MySQL and PHP, and distributed under the GPL.
focuseek searchbox – High performance, multi platform full-text search engine, spiders web or intranet sites, or indexes data you feed to it. Easily scriptable via a SOAP/REST API. Also supports a variety of input formats.
freeWAIS-sf FAQ – Frequently Asked Questions [FAQ] with answers for freeWAIS, a text retrieval system.
Funnelback – Enterprise search engine with advanced text and metadata capabilities.
Google Search Solutions – Hosted search options and a search hardware product.
Harvest – Free GPL-licensed distributed search system to collect files of many different formats and make the information searchable using a web interface
HITS web search – Jon Kleinberg’s method of searching the Web. Links to the Cornell researcher’s online publications list.
Hosted Site Search – FusionBot search engine, a remotely hosted search service.
ht://Dig – A complete indexing and searching system for a small domain or intranet. Source code provided under the GPL.
IB 2.0 WebCat – IB 2.0 is the commercial “big brother” of the public Isearch package.
IBM Intelligent Miner – Identifies and extracts business intelligence from your data assets.
Infoglide Software – Similarity Search Engine finds similarities and relationships between data in databases.
Innerprise – Scalable search engine software for corporate web sites and intranets.
InTEXT WebSearch – Windows/Unix server search engine, includes natural-language querying and document summarization.
Java Search Engine – Search engine written in Java supports XML, XSLT and EJB.
Kscripts Web Site Indexer Search – Perl script indexes and allows Boolean searching. Suitable for indexing up to approximately 4,000 pages.
LinkSearch – Search engine that makes use of hypertext links and paths to provide rankings. Open source project under the GPL.
Managing Gigabytes – Book about indexing techniques and a software package that implements the algorithms.
MnoGoSearch – Search engine software for Internet and Intranet sites. The index can be stored in any of the popular SQL Databases.
Mondosoft – Offers analytics tools to manage content based on behavior. Mondosoft site search engine, reporting and optimization for Web environments.
Open Objects Software – Open Objects Software is the UK integrator for Inktomi Search Software.
Perlfect Search – Free web site indexer and search engine suite. Includes automatic installation tool, meta tag searching, paginated results, relevance ranking and keyword weighting. – Provides audio and Internet-based locator software services for banks, restaurants, retail outlets, and manufacturers.
Search Engine – Perl-based software that allows visitors to search your site.
Simiax – Provides tools to build and maintain portals.
S.L.I. Systems Learning Search System – A scalable search that learns from your users and adapts, provides search suggestions, and reporting.
Suntek Chinese Search Engine – Chinese and English search engine for web sites and intranets. Available for embedding on CDs. Chinese-enabled content management system supports full text and field search in addition to workflow and publication management.
SWISH++ – Unix-based file indexing and searching engine based on SWISH-E. SWISH++ is a complete rewrite developed to circumvent difficulties with the SWISH-E package.
SWISH-E – Search engine for Unix and Windows NT that handles meta tags. Free and open-source under the GNU public license.
Thunderstone – Provides SQL-based relational full-text retrieval, dynamic publishing, object management, and web-indexing software.
TxSearch – Database indexing and searching. Integrates with IIS and Apache and supports ASP and PHP.
Ultra Search – Provides uniform search-and-locate capabilities over multiple repositories, multiple Oracle databases, IMAP mail servers, HTML documents on a web server, or files on disk.
Verticrawl – An Internet search engine and bot that craws web sites and intranets for multiple-format indexing.
Voltix – A J2EE-based enterprise search solution. It can search through both structured and unstructured content including relational databases.
WebGlimpse – Finds information in a related web of pages. Collects and indexes pages based on traversal of links or subdirectories. Create a context-sensitive search by category by linking to relevant pages.
Webinator – Web walking and indexing package to create a retrieval interface to collections of HTML documents. Free for up to 2,000 pages.
YourAmigo – Search engine that uses a server-based agent to seek all URLs on a site, including dynamic pages from databases. Includes a function to keep searches current.
Zoom Search Engine – Free search engine software for your web site or intranet, with documentation and no advertising or dependency on external sites. PHP or ASP is required for the search front-end.