Affinic Debugger GUI for GDB is a powerful graphic user interface for GNU Debugger, GDB. It is designed to improve debugging efficiency by providing many useful features. For the detail, please check out its homepage(click here). It is available on Linux/Windows/Cygwin/Mac OS X.
Compares with other similar products. It provides modern GUI design and functionality than DDD, Emacs, Insight and much more powerful functionality than Kgdb. And it is FREE to use and download so far.