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Open Source Project #183: Ontology Playground — Microsoft's Zero-Backend Visual Ontology Learning Tool

Microsoft's open-source pure-static web app for learning ontology design and Microsoft Fabric IQ. Visual drag-and-drop ontology designer, RDF/OWL import/export, six industry domain pre-built ontologies, nine structured courses with interactive quizzes, and a one-line embeddable widget. Zero server dependency — runs directly in the browser, deployable to GitHub Pages or Azure Static Web Apps. React 19 + TypeScript + Cytoscape.js. 2.3k Stars, MIT license.

·7 min read