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/

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

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/

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

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/

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

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

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