OMCSNet - http://web.media.mit.edu/~hugo/omcsnet/ A freely available semantic network of common-sense knowledge and a set of tools for making inferences using this knowledge. Features download, white papers and developer tools.
Project Halo - http://www.projecthalo.com A research effort towards the development of Digital Aristotle, an inference-based question answering system.
MOTEL - http://domino.mpi-inf.mpg.de/internet/reports.nsf/c125634c000710d0c12560400034f45a/53a2ea0fdf19f6b3c1256040004b0a79!OpenDocument A Knowledge Representation System combining expressiveness of Natural Language Processing with Description Logic.
SATEN - http://magic.it.uts.edu.au/systems/saten.html A Sagacious Agent for Theory Extraction and RevisioN. SATEN is an intelligent object-oriented web-based information management system. It provides an information extraction engine and methods for iterated belief revision. It can also perform nonmonotonic reasoning, possibilistic reasoning, and hypothetical reasoning.
XMaster - http://www.chrisnaylor.co.uk/ Information on a Windows expert system shell. Includes product descriptions and pricing and contact information.
Classic Knowledge Representation System - http://www.bell-labs.com/project/classic/ Features description of the software framework and implemented systems, as well as information on machine learning applied to description logics. Also offers a selected bibliography and details on obtaining the software.
Context Broker Architecture - http://cobra.umbc.edu/index.html CoBrA is an agent-based architecture for supporting context-aware systems in smart spaces like intelligent meeting rooms, smart homes or vehicles.
Mind Graph - http://www.mind-graph.net Graphic techniques for problem solving in maths, computer programming, studying, note-taking, brainstorming and knowledge representation.
DAA Solutions - http://www.daasolutions.com Software company providing KBE capabilities for companies with products requiring custom design as an integral part of their sales process.
FramerD - http://www.framerd.org/ A portable distributed object-oriented database designed to support the maintenance and sharing of knowledge bases.
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