There is more than just Axure for some nice prototyping. Here is a list of the prototyping tools I have used: Axure, Just in mind, MeteorJS and quick peak at Balsamiq.
This tool I’ve used a lot. Now with 7.0 and responsive it is still a good and solid tool but it can take a long time to create a demo/prototype. So depending on the job you might want to use a lighter, faster method.
In a project for a big theater a colleague and I used Meteor to create a prototype. If you want to get a prototype that is so real that you can use it with users this is a good tool. Good for testing and almost the real deal to show the customers. A little bit of knowledge of JS and CSS might come in handy to create prototypes with this and setting this up can take a little bit of time.
Very fast tool for mockups and visualizing quick ideas. Similar in use as Just in mind & Axure but perhaps a bit more IOS orientated. This is not free. Used the demo’s a couple of times but didn’t buy the software because of Axure.