The Strava Go SDK by Strava is an official component to interact with the API. It allows developers to integrate fitness features into applications such as running and cycling. The SDK contains information about activities, athletes, clubs, and gear.
MapQuest's recent entree into mobile developer tools is an interesting one. Choosing Android over iPhone means going toe to toe with Google, a familiar competitor to MapQuest on the mapping front. Mapping is logically MapQuest's turf. The company was helping people find directions online before Larry and Sergey were even in graduate school, let alone leaving to found Google. Of course, another way of looking at it is that Android is in line with MapQuest's latest push to open up mapping data.
TomTom has launched an API that provides programmatic access to personalized audio traffic reports for drivers. Developers can use the TomTom Audio Traffic API to integrate personalized traffic reports with in-car entertainment applications and driver-oriented mobile applications.