10 Completely Free Wireframe and Mockup Applications. Every web designer and developer should have a good and reliable wireframe (mockup or prototype) tool at there disposal.
The importance of such a tool differentiates amongst web designers and developers, some use them, some don’t. Personally, I use them. It is in this initial stage of development that makes web design enjoyable, the coming together of the clients needs and your own creative ideas onto a blank canvas, allowing you to plan effectively the visual arrangement of the sites content. The downside is that a good and reliable wireframe application can come at a heavy price, have you seen the cost of a good wireframe application? MockFlow: Online Wireframe Tool.