ForeUI – Easy To Use UI Prototyping Tool
http://www.foreui.com/

ForeUI is an easy-to-use UI prototyping tool, which can create mockup/wireframe/prototype for the application or website in your mind. Your prototype will be skinnable and you can change its style by switching the UI theme. You can design the behavior of prototype by defining intuitive flow charts to handle specific events. The prototype can be exported to wireframe images, PDF documents or DHTML simulation, which will be very useful for idea sharing, design review, feedback collection or usability testing etc. ForeUI works in Windows, Mac OS X, Linux, Solaris and web browsers that support Java. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.