Metaweb Technologies, Inc. is a company based in San Francisco that is developing Metaweb, a semantic data storage infrastructure for the web, and Freebase, an "open, shared database of the world's knowledge". The company was founded by Danny Hillis, Veda Hlubinka-Cook and John Giannandrea as a spinoff of Applied Minds in July, 2005, operated in stealth mode until 2007 and acquired by Google as the basis of its Knowledge Graph in 2010.
Freebase is a massive, collaboratively edited database of cross-linked data. The idea behind the product is to create a Wikipedia like system for building the semantic web. Freebase allows anyone to contribute, structure, search, copy and use data. It sounds like Wikipedia, but instead of arranging by articles, it is more of an almanac, organized like a database, and readable by people and software.