Version

Use at least version 5.5.0 (stable). Beta versions of 5.5.0 might cause trouble.

Install

https://protege.stanford.edu/products.php#desktop-protege

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Ontology Visualisation mit OWLViz

Enables class hierarchies in an OWL ontology to be viewed and incrementally navigated, allowing comparison of the asserted class hierarchy and the inferred class hierarchy.