Mobello – JavaScript UI Framework (With An IDE) For Mobile Apps

Mobello is an open source JavaScript UI framework that simplifies developing mobile web apps.

The framework aims to provide a native-like experience in mobile, it is optimized for touch events and has 20+ widely-used UI components.

Mobello Mobile Framework

It also has an IDE, named Mobello Studio, that focuses on building mobile apps with HTML5, CS3 and the Mobello framework..

Mobello Studio has a drag 'n' drop enabled  visual design editor, a JavaScript debugger and built-in mobile device emulator.

The API of the framework is documented in detail and it can be a good alternative to other popular ones if improved regularly.