KR, Inc.

Charitable organization concerned with fostering research and communication on knowledge representation and reasoning. Features conferences, educational materials and mailing lists.
http://www.kr.org

Knowledge Interchange Format (KIF)

A DARPA project. KIF is a language designed for use in the interchange of knowledge among disparate computer systems.
http://logic.stanford.edu/kif/kif.html

John Sowa on Knowledge Representation

Provides background material and tutorials on ontology and related topics in logic, conceptual graphs, and natural language semantics.
http://www.jfsowa.com/index.htm

Tockit Project

Aims to create a framework for conceptual knowledge processing in terms of social structures and a common code base. Features software description and contact details.
http://tockit.sourceforge.net/

Modeling and Simulation

Resources and links published by INSEAD on Knowledge Representation and Exchange, Ontologies, Simulation.
http://www.insead.fr/CALT/Encyclopedia/ComputerSciences/System/modeling.htm

Knowledge Representation Resources

A list of knowledge representation resources, part of the AI Education Repository at the University of Southwestern Louisiana.
http://www.cs.cofc.edu/~manaris/ai-education-repository/

Conceptual Graphs Home Page

Features introductory material and bibliography, standard notation, events, projects, tools and researchers.
http://www.cs.uah.edu/~delugach/CG/

WebKB

A set of tools using Conceptual Graphs formalism for building and documentation of knowledge bases, indexing or connecting elements of WWW-accessible documents.
http://meganesia.int.gu.edu.au/~phmartin/WebKB/