ht://Dig  
   A complete indexing and searching system for a small domain or intranet. Source code provided under the GPL.
   http://www.htdig.org/

Simiax  
   Provides tools to build and maintain portals.
   http://www.simiax.com/

Inktomi Search Engine  
   Service provides searching in hosted clusters for specific domains and web sites.
   http://www.inktomi.com/products/search/index.html

Managing Gigabytes  
   Book about indexing techniques and a software package that implements the algorithms.
   http://www.cs.waikato.ac.nz/~ihw/mg.html

dtSearch  
   High-volume text search works with many file types. Features include hit highlighting, natural language, fuzzy, phonic, Boolean, proximity, field, numeric range.
   http://www.dtsearch.co.uk

Emerge  
   NCSA Information Technologies' effort to build a new search infrastructure that addresses issues of scale and heterogeneity.
   http://emerge.ncsa.uiuc.edu/

HITS web search  
   Jon Kleinberg's method of searching the Web. Links to the Cornell researcher's extensive online publications list.
   http://www.news.cornell.edu/releases/April98/websearch.bs.html

SWISH-E  
   Search engine for Unix and Windows NT that handles meta tags. Free and open-source under the GNU public license.
   http://sunsite.berkeley.edu/SWISH-E/

IBM Intelligent Miner  
   Identifies and extracts business intelligence from your data assets.
   http://www.software.ibm.com/data/iminer/

Vicinity  
   Commercial service allows you to provide maps and directions.
   http://www.vicinity.com/

Webinator  
   Web walking and indexing package to create a retrieval interface to collections of HTML documents. Free for up to 2,000 pages.
   http://www.thunderstone.com/webinator/

Infoglide Software  
   Similarity Search Engine finds similarities and relationships between data in databases.
   http://www.infoglide.com/

freeWAIS-sf FAQ  
   Frequently Asked Questions [FAQ] with answers for freeWAIS, a text retrieval system.
   http://www.faqs.org/faqs/wais-faq/freeWAIS-sf/

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.
   http://ashwins.tripod.com/mp3Spider/

IB 2.0 WebCat  
   IB 2.0 is the commercial "big brother" of the public Isearch package.
   http://www.bsn.com/Z39.50/WebCat.html

Mondosoft  
   Offers analytics tools to manage content based on behavior. Mondosoft site search engine, reporting and optimization for Web environments.
   http://www.mondosoft.com/

Thunderstone  
   Provides SQL-based relational full-text retrieval, dynamic publishing, object management, and web-indexing software.
   http://www.thunderstone.com/

The Clever Project  
   Incorporates several algorithms that make use of hyperlink structure for discovering information on the Web.
   http://www.almaden.ibm.com/cs/k53/clever.html

Perlfect Search  
   Free web site indexer and search engine suite. Includes automatic installation tool, meta tag searching, paginated results, relevance ranking and keyword weighting.
   http://www.perlfect.com/freescripts/search/

Portal Juice  
   Provides backend search engine services to micro and vertical niche market portals.
   http://www.portaljuice.com/

whatUseek intraSearch  
   Remotely hosted search engine. Customizable colors and graphics. Free service. Displays advertising in search results.
   http://www.whatUseek.com/intraSearch/

LinkSearch  
   Search engine that makes use of hypertext links and paths to provide rankings. Open source project under the GPL.
   http://linksearch.sourceforge.net

VirTime Everywhere Search  
   Search software for sites and software help systems. Runs locally.
   http://www.virtime.com/ews/

Innerprise  
   Scalable search engine software for corporate web sites and intranets.
   http://www.innerprise.net

Macurious Spider Search Engine  
   A tool to build search engines on web sites.
   http://www.macurious.com/spider/

Mercator Web Crawler  
   Extensible web crawler was rolled into AltaVista Enterprise Search.
   http://www.research.compaq.com/SRC/mercator/

Fluid Dynamics Search Engine  
   Written in Perl. Online-manageable with a web browser.
   http://www.xav.com/scripts/search/

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.
   http://search.mnogo.ru/

Kscripts Web Site Indexer Search  
   Perl script indexes and allows Boolean searching. Suitable for indexing up to approximately 4,000 pages.
   http://kscripts.com

Hosted Site Search  
   FusionBot search engine, a remotely hosted search service.
   http://vertical-search.fusionbot.com

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.
   http://webglimpse.net/

CNIDR Isearch  
   Free software for searching large amounts of text.
   http://www.cnidr.org/isearch.html

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.
   http://homepage.mac.com/pauljlucas/software/swish/

Atrise Everyfind  
   Design a search engine for your web site, intranet, CD, DVD or any portable documentation.
   http://www.atrise.com/everyfind/

Google Search Solutions  
   Hosted search options and a search hardware product.
   http://www.google.com/services/

Findmaan  
   A search engine developed on MySQL and PHP, and distributed under the GPL.
   http://findmaan.sourceforge.net/

Search Engine  
   Perl-based software that allows visitors to search your site.
   http://www.interactivetools.com/products/searchengine/

CareerCast  
   Develops web-based job and resume search software for career, newspaper and employer sites.
   http://www.careercast.com

F3DSearch  
   Software to make topic-specific searches by creating and maintaining a hybrid search engine-directory with a link-indexer.
   http://www.simiax.com/f3dsearch.html

Open Objects Software  
   Open Objects Software is the UK integrator for Inktomi Search Software.
   http://www.openobjects.com

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.
   http://www.astaware.com/new_pro.html

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.
   http://www.suntek.com.hk

S.L.I. Systems Learning Search System  
   A scalable search that learns from your users and adapts, provides search suggestions, and extensive reporting.
   http://www.sli-systems.com/

Verticrawl  
   An Internet search engine and bot that craws web sites and intranets for multiple-format indexing.
   http://www.verticrawl.com/

Java Search Engine  
   Search engine written in Java supports XML, XSLT and EJB.
   http://www.me.lv/jse/

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.
   http://otn.oracle.com/products/ultrasearch/content.html

InTEXT WebSearch  
   Windows/Unix server search engine, includes natural-language querying and document summarization.
   http://intext.com/

Fast  
   Search and personalization software optimised for multimedia.
   http://web.fast.no

ALISE  
   A compact index server optimized for speed and ease of setup. Commercial product for Windows NT.
   http://www.pspinc.com/ntsg/htm/pro-alise.htm

TeraText Database System  
   Text management product for storing, indexing, retrieving and delivering documents or XML records (stored natively).
   http://www.teratext.com/get/page/browser/browser?category=Products/TeraText%20DBS

Dieselpoint, Inc.  
   Search software in 100% Java (J2EE) with parametric, natural language and full-text search capabilities.
   http://www.dieselpoint.com

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.
   http://www.youramigo.com

TxSearch  
   Database indexing and searching. Integrates with IIS and Apache and supports ASP and PHP.
   http://pages.sbcglobal.net/wpilcher50/

CNSearch Pro  
   Indexes .mp3, .html, .doc, .rtf, .xls, .txt. Provides full-text indexing, highlighted quotations in search results, accumulates statistics.
   http://www.cn-software.com/cnsearch/

Harvest  
   Free GPL-licensed distributed search system to collect files of many different formats and make the information searchable using a web interface
   http://harvest.sourceforge.net/

RightHere.net  
   Provides audio and Internet-based locator software services for banks, restaurants, retail outlets, and manufacturers.
   http://www.righthere.net

Voltix  
   A J2EE-based enterprise search solution. It can search through both structured and unstructured content including relational databases.
   http://www.voltix.com

Namazu: a Full-Text Search Engine  
   Namazu is a full-text search system. Not only does it work as a small or medium scale web search engine, but also as a personal search system for email or other files.
   http://www.namazu.org/

Cenozoa  
   Provides search and recommendation engine services to e-commerce companies who want to offer the use of these tools on their existing websites.
   http://www.cenozoa.com

Panoptic: Enterprise Search Engine  
   Enterprise search engine with advanced text and metadata capabilities.
   http://www.panopticsearch.com/

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.
   http://www.focuseek.com/

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.
   http://www.datalink.se/se/index.html?content=linksearch_en.html

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.
   http://www.wrensoft.com/zoom/

Estraier  
   A full-text search engine for Japanese or English text.
   http://estraier.sourceforge.net/

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.
   http://alkaline.vestris.com/