Isearch  
   Software for indexing and searching text documents, using full text and field based search, relevance ranked results, Boolean queries, and heterogeneous databases. Support for document types such as HTML, SGML, mail folders, and USMARC.
   http://www.etymon.com/Isearch/

Megaputer Intelligence  
   Megaputer provides a complete family of unique solutions for Natural Language Text Retrieval and Analysis, Data Mining and Knowledge Discovery in Databases.
   http://www.megaputer.com

ht://Dig  
   A complete world wide web indexing and searching system for a small domain or intranet. Source code (GPL).
   http://www.htdig.org/

Ultraseek Server  
   The tools they use at their site for sale. Demo version available for download.
   http://software.infoseek.com/products/ultraseek/ultratop.htm

Zebra Z39.50 Search Engine  
   Zebra is a fulltext and free-text indexing and retrieval system that conforms to ANSI standard Z39.50. It is very good for indexing and searching highly structured data such as MARC records, and GILS records. The Zebra server is freely available for nonco
   http://www.indexdata.dk/zebra

Thunderstone Software  
   Thunderstone has a number of full text search related products including their flagship text/relational database, Texis.
   http://www.thunderstone.com/

Dataware Technologies  
   Search engine vendor of BRS/Search, a text based core product, and web enabled products.
   http://www.dataware.com

Managing Gigabytes  
   Information and select sections of a book about indexing and compression techniques for documents and images. Also provides information about open source IR system released with the book.
   http://www.cs.mu.oz.au/mg/

OpenText  
   Supplier of information retrieval and collaborative software.
   http://www.opentext.com

Glimpse  
   A Unix based indexing and query system. It is good for indexing relatively small amounts of data. Different types of indexes allow you to trade off search speed for index size. The default search engine used in Harvest.
   http://glimpse.cs.arizona.edu/

WinOcular Document Imaging  
   Combined Computer Resources, Inc. (CCR), a software developer and integrator, specializes in customizing and integrating document imaging, COLD report management and workflow software products.
   http://www.winocular.com/

SimpleScan Software, Inc.  
   SimpleScan Software, Inc - providing powerful, cost effective, enterprise wide document management software solutions.
   http://www.SimpleScan.com

Inventory of Full-Text Information Retrieval Software Vendors  
   A project of the IFLA Section on Information Technology
   http://www.ifla.org/VII/s21/p1996/fulltext.htm

IB Search Engine  
   High speed, fully featured, multilingual fielded fulltext engine. Available for many platforms including Solaris, BSD, Linux and Windows-NT.
   http://www.bsn.com/Z39.50

Building Task-Specific Interfaces to High Volume Conversational Data  
   A scholarly paper by Loren G. Terveen, William C. Hill, Brian Amento, David McDonald, and Josh Creter.
   http://www.acm.org/sigchi/chi97/proceedings/paper/lgt.htm

dtSearch  
   Searches all popular file types, with features including hit highlighting, natural language, fuzzy, phonic, boolean, proximity, field, numeric range.
   http://www.dtsearch.com/

LegalProNet.Com  
   A secure web based service, allowing attorneys to store, manage, search and access their documents through the internet.
   http://www.LegalProNet.com

Web Search Engine Software  
   Create and maintain your own search engine quickly and easily using our perl script and database management tool.
   http://www.web-search.com/websoft.html

SearchExpress  
   Provides document scanning, optical character recognition and full-text searching.
   http://www.searchexpress.com/

Cheshire II Project Home Page  
   Cheshire II is a "Next-Generation Online Catalog and Full-Text Information Retrieval System." It features advanced IR techniques, including support for Boolean and probabilistic 'best match' ranked searching, SGML/XML as the primary data base f
   http://cheshire.berkeley.edu/

The Combine Harvesting Robot  
   Combine is an open system for harvesting and threshing (indexing) Internet resources.
   http://www.lub.lu.se/combine/

Simple Web Indexing System for Humans  
   SWISH-Enhanced is a fast, powerful, flexible, free, and easy to use system for indexing collections of Web pages or other text files.
   http://swish-e.org/

Onix Full-Text Indexing and Retrieval Toolkit  
   Toolkit (SDK) for adding full-text indexing and searching capabilities to applications. Ported to a wide range of platforms and highly scalable. Designed for use in both large and small scale systems. Free evaluation download.
   http://www.lextek.com/onix/

KE Software Inc.  
   KE Texpress is an object/relational database that supports text as well as multimedia objects. Runs on a wide variety of platforms including Linux.
   http://www.kesoftware.com/

AnswerMap  
   End user software for searching your documents and e-mail. AnswerMap finds specific answers to your typed questions in seconds. View short summaries, full passages, or entire files.
   http://www.cognitium.com/answermap.html

MicroISIS by UNESCO  
   Non-numerical information storage and retrieval software developed to allow institutions, especially in developing countries, to streamline their information processing activities.
   http://portal.unesco.org/ci/ev.php?URL_ID=2071&URL_DO=DO_TOPIC&URL_SECTION=201&reload=1035195531

Lucene Search Engine  
   Jakarta Lucene is a full-featured text search engine written entirely in Java, and it is an open source project available for free download from Apache Jakarta. The current goals of the project are primarily to provide application and also a platform for
   http://jakarta.apache.org/lucene/