ForeUI is a handy UI prototyping tool. It can rapidly create static or interactive, skinnable UI prototypes of your Web site or software. It features various UI themes (Wireframe, Windows, and Mac), interactive simulations that run in Web browsers, customized element creation, slide show and PDF exporting, and a rumple effect to suggest incompletion.
OfficeFloor provides true inversion of control for building simple static to complex real-time Web applications that are "build once, run anywhere" - even with cloud computing. It allows you to wire together a working prototype in minutes, extend the prototype to a working Web site in hours, and deploy and run anywhere. The code is self documenting to make support easier. It aims to be "The Java Web Answer" for rapid application development for Web applications.