Protégé is a
free,
open source
ontology editor and knowledge-base framework.
The Protégé platform supports two main ways of modeling ontologies via the
Protégé-Frames and
Protégé-OWL editors.
Protégé ontologies can be exported into a variety of formats including
RDF(S), OWL, and XML Schema. (more)
Protégé is based on Java, is extensible, and provides a
plug-and-play environment that makes it a flexible base for rapid prototyping and
application development. (more)
Protégé is supported by a strong community of
developers and academic, government and corporate
users, who are using Protégé for knowledge
solutions in areas as diverse as biomedicine, intelligence
gathering, and corporate modeling.