Structure101 has several great tools for analyzing and refactoring your code base, and they have just finished adding the ability to import Understand projects into their tools. You should definitely check it out.
As an extra incentive, they are offering a free license to the first 3 Understand users who demo one of their tools and send an exported image such as the one below of any part of their code or an Open Source project. Just send it to email@example.com and tell them Kevin sent you 🙂
To be fair to another great partner, Lattix can also import your Understand projects and is a great tool for organizing and refactoring your code, so give them a look.