OWLGrEd
5.5#26 in knowledge graph softwareFree planFree planWebWindows
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OWLGrEd suits individuals or teams creating ontology models and viewing them as graphs. It is relevant to users who need web or Windows access and .owl importing without a paid plan.
RDFox may suit teams building RDF knowledge-graph systems that need rule-based reasoning, APIs, or deployment across different environments. Its evaluation license is limited to evaluation and non-commercial use.