ROWLEX:.NET library and toolkit built to create and browse RDF documents easily. It abstracts away the level of RDF triples and elevates the level of the programming work to (OWL) classes and properties.
AlchemyAPI: web service API / SDK that converts unstructured text into RDF & Linked Data.
The Sweet Tools listing of 800+ RDF and -related tools, most open source, and sortable by category and language (among other facets).
