UberKit is an Objective-C wrapper made to interface with the Uber API, allowing developers to call the Uber API without requiring users to sign into their Uber account. Calls to the Uber API can be made to request information on available car types, driver location expressed in geo-coordinates, time estimates, estimated prices (including currency conversion when applicable), as well as user account history and activity.
The Schiphol airport in Amsterdam has published a Flight API for developers to build new, creative passenger experiences. The API provides access to flight and airline data on the more than 90+ airlines that operate at the airport. Examples include flights, airline, status, destinations, and more.
PayPal has officially released PayPal X, its next generation platform that includes a variety of APIs and other resources for developers. Primarily aimed at allowing developers to embed payment processing in a wider array of applications and environments, this is a major expansion of PayPal's APIs.