Note to users of Mac OS X 10.7.5 and above: The default Gatekeeper settings for Mountain Lion are to only allow application downloads from the Mac App Store and identified developers. The Protege software does not carry "identified developer" status, and you may see an error when attempting to download that the installer file is "damaged and can't be opened". To successfully download the installer file, navigate to Apple menu | System Preferences... | Security & Privacy | General tab, and select "Anywhere" from "Allow applications downloaded from".

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We strongly encourage everyone to use the Stanford hosted solution of WebProtege, where we frequently push new features, bug fixes, and regularly back up data. If however, you require a local installation, use the download link below.

• Download WebProtégé
• View release notes

This version of Protégé supports OWL 2 ontologies. For more information about how to choose an install method, read the "How do I install Protege-OWL" question in the FAQ.

• Download Protégé - platform independent installer program
• Download Protégé - ZIP file (no 1.6 VM, no executable file included)
• Download Protégé - OS X application bundle
• View release notes
• View javadoc

This version of Protégé supports OWL 1.0, RDF(S), and Frames ontologies.

• Download Protégé - platform independent installer program
• View release notes
• View javadoc for Core Protégé and Protégé-Frames
• View javadoc for Protégé-OWL
• Get source code for Core Protégé and Protégé-Frames
• Get source code for Protege-OWL
• Get source code for the Standard Extensions Library