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Languages and Standards  (7)
Published Ontologies  (13)
Software and Tools  (20)
Thesauri@  (34)
Tutorials  (10)

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.
Ontolog - Ontolog is an open, international, virtual community devoted to advancing the field of ontological engineering and semantic technologies, and advocating their adoption into mainstream applications and international standards.
Ontologies Come of Age - Paper by Deborah L. McGuinness discussing ontologies and requirements for their effective use on the web. [2002]
Ontologies For Education - A topic-map driven portal focused on application of ontologies and similar technologies to educational domains.
Ontology Engineering: a survey and a return on experience - Research report by INRIA, presenting the state of the art of engineering techniques and a project description. (downloadable PDF)
Ontology Engineering Background - Overview of methodologies, papers and people.
Ontoweb - The community site for Ontoweb, a European Union founded project about Ontology-based information exchange for knowledge management and electronic commerce.
OWL Web Ontology Language Reference - Detailed description of the OWL W3C specification.
Principles of ontology - Mailing list archive. Some basic definitions by John Sowa.
WonderWeb : Ontology Infrastructure for the Semantic Web - A project aiming at large-scale deployment of ontologies as the foundation for the Semantic Web.
You're It - A weblog about social tagging.


Ontology is Overrated: Categories, Links, and Tags - Clay Shirky explores online categorization, contrasting ontologies with folksonomies. (May 26, 2005)
Adaptive Path - Metadata for the Masses - Discussion of the promise and problems of classification systems created by nonprofessionals. (October 19, 2004)