ForeUI can create interactive prototype of your desired website or software with drag and drop. You can define the behavior of each element within the prototype and run the simulation in web browser. You can even create your own element to accelerate your future prototyping. Various UI themes for prototyping are supported, thus you can switch the fidelity of the prototype. So far you can choose the UI theme from Hand Drawing, Wireframe, Windows XP, Mac OS X and Windows 7. You can also demonstrate the prototype as slide show. Exporting the prototype to Images, PDF and DHTML are supported as well.