The Google Fit SDK is an open ecosystem made up of Android device APIs & a RESTful API for all platforms to access. The APIs access wearable device sensors to sync Google Fit data with a single repository, the Google Fit Store, where they can interface data with 3rd party applications. The SDK consists of the fitness store, a sensor framework, permission and user controls, and the Google Fit APIs.
The Fleetly API infuses your app with tools for the workout crew. Information is available through a user account. In a crowded fitness app market, Fleetly aims to make the work outs social. You earn badges but also get ranked against others.
An independent, open source platform aimed at making it easier for governments and businesses to publish open data has released a new version of their API. The CKAN API allows access to catalog listings of open datasets, full-text searches, and sharing of statistics on open data usage.