The WireFrame Viewer/Editor is a tool for the gathering of functional requirements. You and your client can sit down with it and decide WHAT you want the the proposed application to do. You will get to describe each stage/page/function of the application in English or Spanish or any natural language you like. You will also define all of the ways the application can get from one state to another state, using Exit=Destination pairs.

Your clients can edit the wireframe data, with just a few minutes' training, and they can browse through the proposed application, looking at each state, until they are happy that the wireframe correctly describes the application they want built. At this point, the wireframe datafile can be printed, or the QuickMap of the wireframe, and signed-off by all parties.

At no time during the wireframing phase is the look of the application considered.

The wireframe becomes part of your development agreement. Use it as the basis for your prototype, and later as the basis for your actual code. Use it for doing function-point estimation, as it gives a very good indication about the number, type, and complexity of the various application functions.

Hal Helms (of course) wrote the original, and then I added a few enhancements of my own, but now our WireFrame Viewer/Editor has gone Open Source. Download the latest release, or contribute to further development, at SourceForge.