Freebase is an online collaboratively-edited database of cross-linked data created by Metaweb Technologies. An early entrant into the Semantic Web realm, Freebase has become an integral component of the Linked Data cloud. The data in Freebase is available through direct browsing on the site or through publish API's. http://www.freebase.com/ You can contract with Freebase if you want custom data curated and stored on-line. You can also have data extracted to use locally.
Including Freebase Data in Your Web Pages
Freebase allows your web site to query their open data up to 100,000 times per day for free. Queries can be created through use of Metaweb Technologies Meta Query Language(MQL), Freebase Application Programming Interface(API) or Metaweb TopicBlocks. Program libraries are available for JavaScript, Flash, Python, Perl, PHP, Ruby, Clojure, Java, .Net and Objective-C. http://wiki.freebase.com/wiki/Libraries Metaweb TopicBlocks include data from not only Freebase, but other on-line data sources using Metaweb's metadata.http://www.metaweb.com/topicblocks If you are familiar with JSON, you can take advantage of creating custom queries using MQL.
