API Network

CrunchBaseCrunchBase is a product of TechCrunch and is a directory of technology companies, people, and investment profiles especially for companies involved in Web 2.0. The read-only API allows for retrieving all information that is available from the database, with some search criteria, and it uses JSON for the output formats. It is not necessary to have a developer account or an API key, and there are no current restrictions on the number of requests.Reference
Yahoo Messenger
Mobile Vikings
Machine Linking