A knowledge modelling Java application developed by the Knowledge Media Institute. Internal model is build as a frame system conformant to OKBC protocol. Version 1.1 supports OWL.

A simple ontology editor allowing to build ontologies according to a methodology proposed by Bruno Bachimont. Supports OWL, DAML+OIL and RDFS formats. Free download.

A simple web service allowing to display class and property hierarchies from a DAML or OWL file.

Program and Proceedings of OntoWeb-SIG3 Workshop at the 13th International Conference on Knowledge Engineering and Knowledge Management.

An ontology inference engine for OWL, using Flora-2, an object-oriented knowledge base language and application development platform.

A framework for loading ontologies from files and via the Internet and for locally creating, modifying, querying, and storing ontologies.

A platform for Semantic Application Integration and the Semantic Web using ontology, taxonomy and inferencing technologies.

OilEd is a free ontology editor supporting DAML+OIL, developed by the University of Manchester. Download available. Latest version supports OWL.

A distributed collaborative environment to browse, create, edit, modify, and use ontologies. Provided by the Knowledge Systems Laboratory of Stanford University.

Survey of ontology editing tools summarizes more than 50 software tools and provides a brief introduction to the topic. Includes resources.

Makers of ontology engineering tools for enterprise information integration.

OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine.

An on-line tool that identifies an ontology as OWL Lite, OWL DL, or OWL Full.

Free on-line or downloadable tool allowing to check OWL content for syntactic and semantic errors.

An on-line tool providing various reasoning services for OWL documents, such as OWL species, consistency checking, satisfiability, entailment test.

pOWL is web-based knowledge base edititing and management solution for the Semantic Web. It supports collaborative browsing, querying and editing of RDFS/OWL Ontologies and exposes an extensive API for PHP programmers.

A free open-source Java tool providing an extensible architecture for the creation of customized knowledge-based applications. Includes documentation, events and publications.

A Semantic Web inference engine for developing ontologies and query answering over RDF, RDFS/DAML or OWL.

A merging and diagnostic ontology environment. It is distributed for external use and has been used in academics and also commercially.

Developed in order to evaluate the performance of the WebODE ontology engineering workbench.

Allows an organisation to ensure semantic interoperability of metadata, through consistent terminology in all of its applications, assets and activities.