Understand® is an IDE built from the ground up to help you fully comprehend your source code. Analyze it, measure it, visualize it, maintain it - Understand it.
If your code is safety or mission critical or has grown larger than one person can handle, you owe it to yourself to try out Understand. Understand will help you discover exactly what your code is doing and why, and you will soon be wondering how you lived without it. Join the 20,000 other engineers that already Understand their code and try a fully functional trial now, or learn more.
I work on a fair amount of older code, both open-source and proprietary. I have found Understand to be an indispensable tool for learning new (to me) code. What I find most useful are the graphs that help me understand the relationships between different components/objects of a given set of source files.
I would not be able to learn code as quickly as I can without the assistance of UNDERSTAND!