Knowledge Navigation Suite 
A suite of information indexing and classification tools that supports information sharing and textual data mining based on natural language processing, statistical pattern analysis, and neural networks techniques. Supports large-scale terabyte data analysis and visualization.
http://www.knowledgecc.com/Willow
A now discontinued Z39.50 bibliographic information retrieval tool from University of Washington.
http://www.washington.edu/willow/home.html
The Glasgow Information Retrieval Group
Has a research program aimed at giving better access to multi-media information.
http://ir.dcs.gla.ac.uk/
Information Retrieval
An online book by C. J. van Rijsbergen, University of Glasgow.
http://www.dcs.gla.ac.uk/Keith/Preface.html
Text REtrieval Conference (TREC)
An annual information retrieval conference and competition, the purpose of which is to support and further research within the information retrieval community.
http://trec.nist.gov/
The Center for Intelligent Information Retrieval
University of Massachusetts research lab focused on efficient access to large, heterogeneous, distributed, text and multimedia databases.
http://ciir.cs.umass.edu/
MultiCentrix
Software for information mapping, knowledge management, and computer aided thinking.
http://www.multicentric.com/
Information Retrieval Research
An up-to-date overview of research in the field of information retrieval.
http://www.searchtools.com/info/info-retrieval.html
Modern Information Retrieval
A recent IR book, covering algorithms, implementation, query languages, user interfaces, and multimedia and web retrieval.
http://www.sims.berkeley.edu/~hearst/irbook/
AgentWeb: Information Retrieval and Knowledge Management
IR and KM resources specifically relating to intelligent software agents. Includes a wide variety of web resources with good descriptions.
http://agents.umbc.edu/Topics/Related_Topics/Information_retrieval_and_knowledge_management/index.shtml
Resources for Text, Speech and Language Processing
A collection of resources in a variety of fields related to text, speech and language processing. These include computational linguistics, information retrieval and machine learning. Here you can find pointers to useful Web sites, as well as lists of relevant books, newsgroups and mailing lists.
http://www.cs.technion.ac.il/~gabr/resources/resources.html
Javaisis 3.0
JavaIsis is an open source Java application by which you can manage a CDS/ISIS database with any Java Virtual Machine.
http://web.tiscali.it/javaisis/
Index Data
Offers courses, software solutions, consultancy aid, and support, relating to Z39.50, Dublin Core, Metadata, and XML.
http://www.indexdata.dk/
Clairvoyance Corporation
Develops a suite of component technologies for unstructured text management and analysis. Features overviews of technologies and research initiatives, with company background.
http://www.clairvoyancecorp.com/
Delphes Technologies International
Publisher of information retrieval software for personal and corporate knowledge management using natural language technology under the brand name Diogene.
http://www.delphes.com/portal.asp?Language=en
Extensio
An information integration solution. It makes information from ERP implementations, CRM databases, custom applications, EAI and EIP solutions and the Internet, available on request.
http://www.extensio.com/
Collexis
A global company developing software for knowledge retrieval. Collexis both retrieves data and discovers relationships between items via clustering and/or aggregation.
http://www.collexis.com/
