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Protégé

System software
Protégé is a free, open source ontology editor and a knowledge management system. The Protégé meta-tool was first built by Mark Musen in 1987 and has since been developed by a team at Stanford University. The software is the most popular and... Wikipedia
Initial release: 11 November 1999; 24 years ago
License: BSD 2-clause
Operating system: Linux, Mac OS X & Windows
Platform: Java VM
Stable release: 5.5.0 / 15 March 2019; 5 years ago