Some of the tools are simply editors for a particular technology (eg, Protégé), other provide complex services (eg, AllegroGraph. It must be said that the borderline between this category and Programming Environments can be a bit fuzzy.
getSchema's RDFa Lite extractor is a REST web service to extract RDF [1] data from RDFa Lite [2] annotations and provide the semantic information as N-Triples [5] , N3 [3] and JSON [4].