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.
This is a specification of a precise semantics, and corresponding complete systems of inference rules, for the Resource Description Framework (RDF) and RDF Schema (RDFS).
This site is a complementary effort by people from the Linked Data community to support Schema.org deployment and usage with a special focus on Linked Data:
A story about the Semantic Web Interviews with: Tim Berners-Lee Clay Shirky Chris Dixon David Weinberger Nova Spivack Jason Shellen Lee Feigenbaum John Hebeler Alon Halevy David Karger Abraham Bernstein
Annenberg Networks Network Theory Seminar:
It`s not a Web of computers, it`s a Web of People.... Sir Timothy Berners-Lee, the inventor of the Web, is talking about the history of the Web and on the subject of Web Science