Maqetta is a drag and drop UI design tool that runs in your browser

Drag-and-drop HTML5 authoring in your browser

Need to prototype an HTML5 app? Forget coding. Hand-eye coordination is just about all you need to prototype with Maqetta, a browser-based WYSIWYG tool for desktop and mobile applications. This first article in a three-part series introduces this free, open source project that runs in a browser and lets designers drag and drop a rich set of widgets to build live UI mockups. In Part 1, get to know Maqetta’s major functions and features while prototyping a realistic mobile application.

Maqetta means mockup, Part 1: Design an HTML5 mobile UI