RDFSharp 
RDFSharp has a modular API made up of 3 layers:
- Create and manage RDF models (resources, literals, triples, graphs, namespaces, ...)
- Exchange them using standard RDF formats (N-Triples, TriX, Turtle, RDF/Xml)
- Create and validate SHACL shapes (shape graphs, shapes, targets, constraints, reports, ...)
- Create and manage RDF stores for context-aware modeling of RDF data (contexts, quadruples, ...)
- Exchange them using standard RDF formats (N-Quads, TriX, TriG)
- Pick a store extension to save RDF data on many supported providers
- Create and execute SPARQL queries on graphs, stores, federations and SPARQL endpoints
- Create and execute SPARQL operations on graphs, stores and SPARQL UPDATE endpoints
An additional layer is available for working in native and expressive way with OWL-DL ontologies