As part of a comprehensive user experience process, along with wireframing, rapid prototyping plays a huge part. It allows you to examine more than just the static strategy and interactions, but processes and experiences that are inherently more complicated. Such as interactive applications, websites.
Rapid prototyping has been used throughout the history of software development but is yet to play a major part in web development. Fortunately it’s now being spoken about alot more (http://madebymany.co.uk/the-future-of-wireframes-001992) and pushed to clients under the sell of tangible benefits, and received under gradually more understanding accounts.
Still developing an understanding and process myself, I’ve began to collate and review a selection of services that offer such prototyping. I’ve not used any thoroughly yet, but I hope to dip my toes in soon!
Thoughts on any of the below, or even other approaches would be interesting to hear.
Protoshare
http://www.protoshare.com/
An advanced web-based wirframine & prototyping solution. Works in the browser, and offers facility to prototype fairly complicated user flows. Has a collaborative system built-in, with comment system etc.
Flairbuilder
http://www.flairbuilder.com/
Very similar to Protoshare, but the authoring application works via a desktop app. Pushing final wireframes and prototypes to the cloud, where reviewers can view via another desktop or the website.
Looks pretty good, but hard to tell if it offers anything more than protoshare without getting our hands dirty.
Mockflow
http://www.mockflow.com/
Quite a slick Flash based interface, with facility to develop all user flows that you can replicate in the Flash IDE. Similar to both Flairbuilder and Prototype, in that reviewers can view exports online, and add comments etc.
Mockingbird
http://www.gomockingbird.com/
Really simple rapid wireframing application that offers simple sitemapping and link-up functionality. No advanced user flow prototyping, but looks a good option to flesh out an idea.
Balsamiq
http://www.balsamiq.com/
This little application has picked up alot of hype, but as far as I’m aware it’s only a wireframing application. Thought I’d throw it in there anyway.