Protégé

Protégé is a free, open-source software tool that helps users create, organize, and manage complex information structures called ontologies. An ontology is like a detailed map of concepts and their relationships within a specific domain—such as medicine, engineering, or biology. Protégé allows professionals to model knowledge systematically, making it easier to share, analyze, and automate processing of information. It is widely used in research and industry for developing semantic frameworks that enable intelligent data integration, reasoning, and decision-making.