What free screen design tools are available [closed]

Question

I am looking for a free tool to quickly create a screen design in a workshop with a customer (for a web application).

The focus of the tool should be on a functional definition of screens and not on the design of them.

Do you have any suggestions for an appropriate tool?

Answer 1

Balsamiq

• Online
• Quick and easy to use
• Drawings have a hand drawn feel so you can avoid design details and focus on layout and function
• You can save (XML) your drawing to open up later
• Can save as drawing an image

Answer 2

I've found mockupscreens to be pretty good. The designs look exactly like works in progress and keeps clients from getting distracted

Answer 3

Pencil is pretty good:

Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms.