empolis - XML and SGML publishing systems integrator, offering consultancy, design, development, products and training.
GooseWorks - An open-source implementation of the Topic Maps Processing Model. Provides information on the software, contact details, and application downloads.
InfoLoom, Inc. - Provides services in the domain of information management, focusing on XML-based and topic maps-based applications.
Mondeca - A software company dedicated to index management, index navigation, content organization. Offering the software tool Intelligent Topic Manager.
Ontopia - A company dedicated to providing information and knowledge management (KM) solutions based on the topic map standard (XTM).
TopicMaps.org - An independent consortium of parties interested in developing the applicability of the Topic Maps Paradigm to the World Wide Web, by leveraging the XML family of specifications as required.