I currently create click-through mockups using Balsamiq for my usability testing. After the concepts and flow have been decided, I would like to do a high-fidelity prototype to show stakeholders the real look and feel of the application before it goes into development. The problem is that I am not a developer or a web designer so I don't know how to code.
Are the any high fidelity prototyping tools that I would be able to use without having to know how to write code? Or alternatively something that is relatively easy to learn?