Casa Robino

Freebase is a large collaborative knowledge base. It is an online collection of structured data harvested from many sources, including individual 'wiki' contributions.
Freebase data is available for use under a Creative Commons “attribution” license, and an API, RDF endpoint, and database dump are provided for programmers. // unlike the W3C approach to the semantic web, which starts with controlled ontologies, Metaweb adopts a folksonomy approach, in which people can add new categories (much like tags), in a messy sprawl of potentially overlapping assertions