Mockup Builder is a tool that helps to create wireframes and mock ups for web sites and mobile apps. More than 100 UI elements available in two styles, separate icon library, big Gallery of free samples. You can work under online version as well as under desktop one. Any wireframe or mock up can be exported in the three formats. You can also import files in the *.bmml format. Great possibility for online collaboration is also included in the application. You can create different type of the projects from desktop to web one.