Open source (single) editors for RDF, RDFS and full OWL 2.0 along with SPARQL query execution


I am looking for a single open source tool that allows editing of RDFS, RDF and full OWL 2.0 ontologies. Being able to execute SPARQL queries would be a very big bonus. Any recommendations ?


Not exactly open source, but the Free Edition of TopBraid Composer meets the other requirements, including editing of RDF/RDFS or OWL 2 models, as well as SPARQL execution.

Protege4 is open source and allows to create and edit RDF,RDFS and OWL2