OntoSphere

Browser-based RDF and ontology knowledge graph editor with OWL-RL reasoning, fully client-side.

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OntoSphere is a free, open-source, browser-based RDF and ontology knowledge graph editor that loads data from files, URLs, or SPARQL endpoints, supports OWL-RL reasoning and multi-algorithm layout, and runs fully client-side with no backend. It's aimed at ontology engineers and semantic web developers who want to edit and reason over knowledge graphs without a heavy desktop tool.

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