The ontology plug-in searches multiple thesauri and ontologies simultaneously by using a web service broker (e.g. AGROVOC, ASFA, Plant Ontology, NERC-C19 ontology, and OceanExpert). It delivers as output a list of selected concepts, where each concept has a URI (or unique ID), a preferred label with optional language definition and the ontology from which the concepts has been selected. The application uses JAVA, Javascript and JQuery. As it is open software, developers are invited to reuse, enrich and enhance the existing source code.