The Clicky PHP SDK by Clicky allows API access to request analytics and monitoring data in real time. File available for download from the official Clicky site. Additional third party plugins at https://clicky.com/help/apps-plugins
The Transit App, an application that provides commuters with real-time transit information on iOS, makes its Transit App API available to developers who may want to integrate the functionality with other applications. The app has already been widely downloaded and received positive customer reviews, and filling the gap that was left when Apple removed transit from its own Maps app, it seems to be a really useful tool for anyone who relies on public transportation and the ability to get accurate and timely travel information.
While working with Big Data affords a lot of potential business value the complexity of building applications that manipulate all that information can be nothing short of daunting. Not only do most of the currently popular approaches require developers to master arcane interfaces such as MapReduce, the performance of the application tends to suffer under the weight of all the data that needs to be processed.