The Google Fusion Tables Objective-C SDK by Google helps to access the JSON APIs. It is recommended to use iOS 3 or later and Mac OS X 10.5 and later. Contents include introduction and example applications. Support available in Google discussion group at https://groups.google.com/forum/#!forum/google-api-objectivec-client
We have covered BigML.com API for making machine learning models here before. Recently BigML made some innovative changes including new data visualization and new classification ensemble models, all doable by API. Here is an interview with Fransisco J Martin, CEO of BigML.com.
Google announced a complete rebuild of its Cloud Datastore API. The update provides an entirely new platform for cross-platform access to its NoSQL database. Google reports better performance and reliability during tests of the new offer. v1beta2 will remain available for 6 months.