Meili is an open-source (MIT-License) cross-platform game engine for mobile-based active and sensor-based games. Built on the Cordova/PhoneGap framework, Meili allows for easy programming via a text-based JSON data format, while retaining additional capacities through HTML, Javascript, and PhoneGap plug-ins to further extend the engine.
Once you assemble your content, and structured JSON programming you can compile the entire package straight to a standalone app for distribution on app-stores worldwide.