MobiOne is a powerful and free iPhone and Palm Pre emulator (currently for Windows only) with a drag-n-drop mobile-web visual designer for mockups and mobile HTML code generation functionality.

It has various mobile design templates, updated OSS components, screen capture, multi-touch, gesture support and more.

MobiOne iPhone Emulator

The tool doesn't require any SDK to be installed as it takes advantage of HTML5, CSS3 and JavaScript for development.

MobiOne also supports PhoneGap (an open source, JS-based mobile development toolkit)

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