This Linux Semantic tool for Web Services is a set of Eclipse plug-ins that allow developers to insert semantic annotations into a WSDL document that describe the semantics of the inputs, outputs, preconditions and effects of service operations. Semantic matching and composition is based on the algorithms using ontology-based inferencing. The ontologies are represented in Web Ontology Language (OWL), and inferencing is accomplished via the ABLE rule engine. This technology is part of the Emerging Technologies Toolkit (ETTK).