Tool Overview
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. 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. Protégé software is currently transitioning from the current version (Protégé 3.X) to an entirely new release (Protégé 4.x). Protégé 3.X is widely used and the adoption of Protégé 4 is slowing happening. Because of this, you will find resources for both versions.
If you are interested in the current difference between the two, please read the comparison on the Stanford website 
.
Installation and Downloads
As Protégé is an open source product, downloads are available through the Stanford Protégé site:
Downloads for Protégé 3 and Protégé 4 The Code Repository can be found at these Stanford sites:
Forum and Support
The Protégé Bug Tracker can be found on a Stanford service: Protégé Bugzilla
What's New
Protégé 4.1 Release
July 26, 2011
The highlights of this release are:
- Full conformance with the OWL 2.0 language specification
- Automatic update mechanism for distributing new features and bug fixes
- New application bundle format distribution for the OS X community
- Direct, in-memory connection to the HermiT and FaCT++ reasoners
For further information, please visit:
Protégé 3.4.8 Release
January 12, 2012
The highlights of this release are:
Bundling an updated version of Jena
(version 2.6.4)Fixed a number of bugs in the MappingMaster plug-in
For further information, visit:
For information about previous versions of Protégé, please visit Protégé Past Versions.
