(sorry, no thumbs...)

Ontology Browser Ontologies can be interactively explored, with options to select namespaces and visualization styles. view big

Visual queries While browsing an ontology, it is possible to declare variables, and to use the resulting graph pattern for queries view big

Semantic transformations of ontologies All ontologies are elaborated ([inference support]) before they are the presented to the user (in queries, visual queries, browsing...). Here some inference rule produce an elementary perturbation analysis view big