Can create down and dirty wireframes in a few hours or responsive hi-if prototypes as functional specs for a project.

Azure makes it fast and easy to create wireframes, mock-ups, and interactive prototypes of all levels of fidelity. It makes it easy to share results, collaborate, and make changes. Such a valuable tool for any UXers tool box.

Good tool for wireframing, has an extensive tool set to accomplish most of the design requirements. Great for team collaboration and work sharing, In built versioning control is very useful. Eases the process of unit testing because Axure exports to HTML and runs on all major browsers.