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

Supplier of information retrieval and collaborative software.

SWISH-Enhanced is a fast, powerful, flexible, free, and easy to use system for indexing collections of Web pages or other text files.

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

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.

Searches all popular file types, with features including hit highlighting, natural language, fuzzy, phonic, boolean, proximity, field, numeric range.

KE Texpress is an object/relational database that supports text as well as multimedia objects. Runs on a wide variety of platforms including Linux.

Suite of search software products that finds information in multiple file formats and languages. Features product descriptions, evaluation version download, company profile and contact information.

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 format, ...

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.