inPreso Screens

inPreso Screens is an Adobe AIR application that enables you to create software mock-ups and website wireframe designs that can help you visualize your ideas or communicate design concepts with developers. The program allows you to drag and drop common GUI elements into place, including buttons, toolbars, combo boxes, radio button and other common controls, and you can also insert shapes, images, Flash and text. The resulting mock-up can be saved as PNG file or uploaded to the web and shared with others via screenshot links or interactive web player. Other features include support for publishing in project management web apps, an image library with miscellaneous icons, symbols and widgets, desktop or browser based editing, and more. The trial version can be used freely with limited features.