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JetSetMe is a project that visually displays the roaming habits of mobile phones that operate on the O2 network. The company Provides the JetSetMe API that allows developers to create applications that make use of this data. In the United Kingdom O2, owned by Telefónica, is the second-largest telecommunications provider. JetSetMe taps into network resources to access the information necessary to understand how users move throughout Europe.
Popcarte is a service for consumers, taking their uploaded photo and turning it into a card of the customer's choosing, from postcards to invitations to thank you notes, to special occasions, and then mails it out worldwide. The Popcarte API lets developers integrate the service into their apps.
An application that shows you if your train will be late, and that in real-time! Even better, imagine that bundled with an API that gives you access to all that data. So happened in Germany with the application Zugmonitor (German for train monitor) and the corresponding Zugmonitor API.