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

Ontology Building: A Survey of Editing Tools
Survey of ontology editing tools summarizes more than 50 software tools and provides a brief introduction to the topic. Includes resources.

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

Apollo
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.

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

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

Ontology Works, Inc.
Makers of ontology engineering tools for enterprise information integration.

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

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

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