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Official Search Engine Blogs 

Google

Official Google search blog. "Googler insights into product and technology news and our culture."

MSN

Official MSN search blog

Yahoo!

Official Yahoo! search blog. "A look inside the world of search from the people of Yahoo!"

Ask Jeeves

Official Ask Jeeves blog.

Google 

Official Google search blog

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Yahoo! 

Official Yahoo! search blog

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Ask Jeeves 

Official Ask Jeeves blog

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MSN 

Official MSN search blog

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Links 

Perlfect Search

Free web site indexer and search engine suite. Includes automatic installation tool, meta tag searching, paginated results, relevance ranking and keyword weighting.

ASPSeek

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.

Cenozoa

Provides search and recommendation engine services to e-commerce companies who want to offer the use of these tools on their existing websites.

Java Search Engine

Search engine written in Java supports XML, XSLT and EJB.

Simiax

Provides tools to build and maintain portals.

Portal Juice

Provides backend search engine services to micro and vertical niche market portals.

CNIDR Isearch

Free software for searching large amounts of text.

Panoptic: Enterprise Search Engine

Enterprise search engine with advanced text and metadata capabilities.

Inktomi Search Engine

Service provides searching in hosted clusters for specific domains and web sites.

LinkSearch

Search engine that makes use of hypertext links and paths to provide rankings. Open source project under the GPL.

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.

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.

Managing Gigabytes

Book about indexing techniques and a software package that implements the algorithms.

VirTime Everywhere Search

Search software for sites and software help systems. Runs locally.

Atrise Everyfind

Design a search engine for your web site, intranet, CD, DVD or any portable documentation.

Datalink linkSearch search engine software

linkSearch is search engine software capable of indexing pdf-, office-, html- and flash-documents. Handles dynamic and static sites, intranets, local nets and is very easy to deploy.

dtSearch

High-volume text search works with many file types. Features include hit highlighting, natural language, fuzzy, phonic, Boolean, proximity, field, numeric range.

Innerprise

Scalable search engine software for corporate web sites and intranets.

Google Search Solutions

Hosted search options and a search hardware product.

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.

Emerge

NCSA Information Technologies' effort to build a new search infrastructure that addresses issues of scale and heterogeneity.

Mercator Web Crawler

Extensible web crawler was rolled into AltaVista Enterprise Search.

Findmaan

A search engine developed on MySQL and PHP, and distributed under the GPL.

Estraier

A full-text search engine for Japanese or English text.

HITS web search

Jon Kleinberg's method of searching the Web. Links to the Cornell researcher's extensive online publications list.

Fluid Dynamics Search Engine

Written in Perl. Online-manageable with a web browser.

Search Engine

Perl-based software that allows visitors to search your site.

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.

SWISH-E

Search engine for Unix and Windows NT that handles meta tags. Free and open-source under the GNU public license.

Mnogosearch indexer/search

A free search spider, indexer and search front end for large-scale web sites. Databases supported include MySQL, Oracle8, MSSQL and PGSQL. Can also index newsgroups and remote sites.

CareerCast

Develops web-based job and resume search software for career, newspaper and employer sites.

IBM Intelligent Miner

Identifies and extracts business intelligence from your data assets.

Kscripts Web Site Indexer Search

Perl script indexes and allows Boolean searching. Suitable for indexing up to approximately 4,000 pages.

F3DSearch

Software to make topic-specific searches by creating and maintaining a hybrid search engine-directory with a link-indexer.

Webinator

Web walking and indexing package to create a retrieval interface to collections of HTML documents. Free for up to 2,000 pages.

Hosted Site Search

FusionBot search engine, a remotely hosted search service.

Open Objects Software

Open Objects Software is the UK integrator for Inktomi Search Software.

Infoglide Software

Similarity Search Engine finds similarities and relationships between data in databases.

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 comprehensive solution for simultaneous online and CD searching.

freeWAIS-sf FAQ

Frequently Asked Questions [FAQ] with answers for freeWAIS, a text retrieval system.

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.

The mp3Spider

This program searches SMB/CIFS shares of all available machines in the given domain recursively, for files ending with .mp3. The program is based on Norbert's jCifs client.

S.L.I. Systems Learning Search System

A scalable search that learns from your users and adapts, provides search suggestions, and extensive reporting.

IB 2.0 WebCat

IB 2.0 is the commercial "big brother" of the public Isearch package.

Mondosoft

Offers analytics tools to manage content based on behavior. Mondosoft site search engine, reporting and optimization for Web environments.

Verticrawl

An Internet search engine and bot that craws web sites and intranets for multiple-format indexing.

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.

InTEXT WebSearch

Windows/Unix server search engine, includes natural-language querying and document summarization.

Fast

Search and personalization software optimised for multimedia.

ALISE

A compact index server optimized for speed and ease of setup. Commercial product for Windows NT.

TeraText Database System

Text management product for storing, indexing, retrieving and delivering documents or XML records (stored natively).

Dieselpoint, Inc.

Search software in 100% Java (J2EE) with parametric, natural language and full-text search capabilities.

YourAmigo

Search engine that uses a server-based agent to seek all URLs on a site, including dynamic pages from databases. Includes an function to keep searches current.

TxSearch

Database indexing and searching. Integrates with IIS and Apache and supports ASP and PHP.

CNSearch Pro

Indexes .mp3, .html, .doc, .rtf, .xls, .txt. Provides full-text indexing, highlighted quotations in search results, accumulates statistics.

Harvest

Free GPL-licensed distributed search system to collect files of many different formats and make the information searchable using a web interface

RightHere.net

Provides audio and Internet-based locator software services for banks, restaurants, retail outlets, and manufacturers.

Voltix

A J2EE-based enterprise search solution. It can search through both structured and unstructured content including relational databases.

Wikipedia articles on search 

Search engine

A search engine is a program designed to help find information stored on a computer system such as the World Wide Web, or a personal computer. The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phrase) and retrieves a list of references that match those criteria. Search engines use regularly updated indexes to operate quickly and efficiently. Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web. Other kinds of search engine are enterprise search engines, which search on intranets and personal search engines, which search individual personal computers.

The above paragraph is from the search engine article on Wikipedia and is released under the terms of the GNU Free Documentation License (view authors | edit | donate).

Google search

Google is a search engine owned by Google Inc. whose mission statement is to "organize the world's information and make it universally accessible and useful." The largest search engine on the web, Google receives over 200 million queries each day through its various services.

In addition to its tool for searching webpages, Google also provides services for searching images, Usenet newsgroups, news websites, videos, searching by locality, maps, and items for sale online. As of June 2005, Google has indexed 8.05 billion web pages, 1.3 billion images, and over one billion Usenet messages ? in total, approximately 10.4 billion items. It also caches much of the content that it indexes. Google operates other tools and services including Google News, Google Suggest, Froogle, and Google Desktop Search. See list of Google services and tools for a complete list.

The above two paragraphs are from the Google search article on Wikipedia and is released under the terms of the GNU Free Documentation License (view authors | edit | donate).

Yahoo! search

Yahoo! Search is a web search engine, owned by Yahoo!. Originally, "Yahoo! Search" merely referred to an interface, Yahoo provided, which would pass on queries to another search engine "behind the scenes" (most recently Google), and display them to the user, under the Yahoo brand. Originally, none of the actual web crawling and storage/retrieval of data was done by Yahoo itself.

Seeking to provide its own search engine results, Yahoo acquired other companies with their own search engines. In 2002, it bought Inktomi, a "behind the scenes" search engine, whose results are shown on other companies' web sites. In 2003, it bought Overture Services, Inc., which owned the AlltheWeb and AltaVista search engines. Initially, even though it owned multiple search engines, it didn't use them on the main Yahoo.com web site, but kept using Google's search engine for its results. However, starting in 2004, Yahoo! Search became an original web crawler-based search engine, with a reinvented crawler called Yahoo! Slurp. Yahoo! Search combined the capabilities of search engine companies it had acquired, with its existing research, and put them into a single search engine. Its new search engine results were included in all of Yahoo's sites that had a web search function. It also started to sell its search engine results to other companies, to show on their web sites. Its relationship with Google was terminated at that time, with the former partners becoming each other's main competitors.

The above two paragraphs are from the Yahoo! Search article on Wikipedia and is released under the terms of the GNU Free Documentation License (view authors | edit | donate).

MSN search

MSN Search is a search engine that allows one to search for web pages, news, products, groups (see MSN Groups), images and Microsoft's encyclopedia, Encarta. Microsoft, through its own web crawling internet bot, msnbot, now provides its own search engine results (list of web addresses with samples of content that meet a user's query). Starting as a beta program in 2004 (based on several years of research), it launched its own results fully in early 2005. Previously, it relied on different search engine companies as sources, including Inktomi, now owned by Yahoo. MSN Search has now begun providing its results to other search engine portals, making it a major competitor to its former parter. A past supplier of paid search engine results, LookSmart nearly collapsed, when Microsoft terminated their relatinship.

The above paragraph is from the MSN Search article on Wikipedia and is released under the terms of the GNU Free Documentation License (view authors | edit | donate).