Microsoft's Ontology-Playground is a zero-backend static app for designing and exporting RDF/XML
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microsoft/Ontology-Playground trended on the TypeScript board today at 2,631 stars, MIT, pushed today, a fully static browser app with a catalogue of pre-built ontologies, a visual designer, RDF/XML export and shareable interactive diagrams. It doubles as onboarding for Microsoft Fabric IQ. For anyone building a knowledge graph over their own data, having a no-install ontology editor that exports standard RDF removes the usual Protégé setup step.