More than one million terms from biomedical ontologies and controlled vocabularies are available through the Ontology Lookup Service (OLS). Although OLS provides ample possibility for querying and browsing terms, the visualization of parts of the ontology graphs is rather limited and inflexible.
['Steven Vercruysse', 'Aravind Venkatesan', 'Martin Kuiper']
OLSVis: an animated, interactive visual browser for bio-ontologies