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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.

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

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

Ultraseek Server
The tools they use at their site for sale. Demo version available for download.

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 noncommercial applications.

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

Dataware Technologies
Search engine vendor of BRS/Search, a text based core product, and web enabled products.

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.

OpenText
Supplier of information retrieval and collaborative software.

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.