PhoneGap

I believe everyone is familiar with the popular info portal, Wikipedia - it was created using PhoneGap framework. PhoneGap is extensively used for developing cross-platform mobile apps. Basically, PhoneGap framework operates on HTML5, CSS3 but it also uses Javascript to render the backend logic for applications. This HTML & JS combination gives it a competitive edge as you can write a single app that is installed as a native app across multiple devices.