ontosphere

Ontosphere is a browser-based RDF/ontology knowledge graph editor that lets users load, author, and visualize RDF data entirely on the client side—no backend required. It is designed for data engineers, ontology developers, and AI researchers who need to edit graphs, run OWL-RL reasoning, and apply multi-algorithm layouts and clustering. Its AI-native integration via MCP tools makes it uniquely interesting for combining semantic web workflows with agent-driven automation.