Visual query construction over RDF data - the QUaTRO2 tool
QUaTRO is a tool for query construction and execution over RDF data leveraging OWL data model. The tool was designed to work with arbitrary ontology and a variety of RDF data sources. The query construction model aims at providing high expressiveness while maintaining an easy to use graphical interface.
Current release of QUaTRO2 as well as installation and user manuals can be found in the "Downloads" section.