First CitySDK app in Android playstore
For the CitySDK project, Wouter Meys and Maarten Groen created an API. The API contains information about Hotel, Restaurants, Museums and Events. This data source got some international attention and a Finnish developer created an application based on this data "Spot in Amsterdam."
This application can be downloaded via: https://play.google.com/store/apps/details?id=nl.spotinams&hl=en