The new version 5.5 of Axure RP Pro has been released a couple days ago after being in public beta for a few months. It’s a very significant upgrade in terms of new features and is free for existing customers with a current license.
Noteworthy features include the ability to load and create external widget libraries (similar to Visio stencils for exemple) that can be shared with coworkers or other Axure users. The new version ships with a bunch of libraries based on the Yahoo Design Patterns Library.
Other improvements include changes to the design environment like the addition of a size and location panel directly in the UI, a Dynamic Panels manager palette and more. Check the changelog for all the details and download the new version here.