Freebase

"Freebase is an open database of the world’s information. It is built by the community and for the community—free for anyone to query, contribute to, built applications on top of, or integrate into their websites."

http://www.freebase.com/

"Wikipedia and Freebase both appeal to people who love to use and organize information. The difference lies in the way they store information. Wikipedia arranges information in the form of articles. Freebase lists facts and statistics. Freebase’s list form is good not only for people who like to glance at facts, but also for people who want to use the data to build other web sites and software."