Languages and Standards
DAML+OIL, Ontology Inference Layer (OIL), OWL Web Ontology Language Guide, Standard Upper Ontology Study Group, The Jorne Project, W3C Web-Ontology Working Group
Published Ontologies
AKT Reference Ontologies, Business Process Management Ontology, DAML Ontology Library, Descriptive Ontology for Linguistic and Cognitive , Mapping of EuroWordnet Top Ontology into Upper Cyc, National Cancer Institute Thesaurus, Ontology for Geographic Information and Metadata, Open Biological Ontologies, OpenCyc, OWL Ontology Library
Software and Tools
Apollo, DOE - The Differential Ontology Editor, Dumpont, EON2002 - Evaluation of Ontology-based Tools, F-OWL, IBM Ontology Management System, Network Inference, OilEd, Ontolingua, Ontology Building: A Survey of Editing Tools
Tutorials
A Framework for Understanding and Classifying Onto, A Guide to Creating Your First Ontology, A Guided Tour to Developing Ontologies Using Ontol, Description Logics Course, Guided Tour of Ontology, OilEd : Building Ontologies, Ontologies: Definitions, Components, Subtypes, Protégé OWL Plugin User's Guide, Tutorial on OWL, What is an Ontology?
Buffalo Ontology Site
Large collection of links and papers about Contemporary Ontology, History of Ontology and Ontological Engineering. From the Department of Philosophy, State University of New York.
CO-ODE
Collaborative Open Ontology Development Environment is a project led by the Medical Informatics Group at the University of Manchester.
European Centre for Ontological Research (ECOR)
ECOR represents a new approach in applying ontology to a variety of problems in information science and related areas, by coordinating institutions, organisations and companies working in the field.
Knowledge-Base and Ontology Projects Worldwide
A catalog of links to projects, tools, and events.
On-To-Knowledge
A project of the European Information Society Technologies, under 5th Framework Program (1999-2002). The project develops knowledge management methods and tools, based on ontology sharing and reuse.
OntoLex'2000 - Workshop Proceedings
The workshop "Ontologies and Lexical Knowledge Bases" focused on the dependencies between formal ontologies and lexical semantics, and construction of lexical knowledge bases. PDF papers available.
Ontology Engineering: a survey and a return on exp
Research report by INRIA, presenting the state of the art of engineering techniques and a project description. (downloadable PDF)
Ontoweb
The community site for Ontoweb, a European Union founded project about Ontology-based information exchange for knowledge management and electronic commerce.
Resource Guide for Semantic Web Developers
Features a continuously evolving collection of web resources related to the Semantic Web.
WonderWeb : Ontology Infrastructure for the Semant
A project aiming at large-scale deployment of ontologies as the foundation for the Semantic Web.