Build Wireframes and Screen
Mockups

UXToolbox supports all of the functionality and features that you would expect from a great Wireframing Tool. An intuitive and easy-to-use interface, a large range of customisable controls and UI Elements, freedom to design for different device types, built in support for annotation and documentation.
View more at http://www.softandgui.co.uk/Pages/Tour/UXToolbox%20Wireframing%20Tool.aspx