ConceptNet is a semantic network containing lots of things computers should know about the world, especially when understanding text written by people.
It is built from nodes representing concepts, in the form of words or short phrases of natural language, and labeled relationships between them. These are the kinds of things computers need to know to search for information better, answer questions, and understand people's goals. If you wanted to build your own Watson, this should be a good place to start!
The Silk framework is a tool for discovering relationships between data items within different Linked Data sources.
Data publishers can use Silk to set RDF links from their data sources to other data sources on the Web.