Qt Creator is not terrible. I've yet to come across a GDB front-end I would qualify as "good". It is a full IDE for writing Qt apps, but it also works for non-

Qt Creator is not terrible. I've yet to come across a GDB front-end I would qualify as "good". It is a full IDE for writing Qt apps, but it also works for non-Qt applications in C or C++ (cmake recommended), and it has some of the best GDB integration. It is also free (GPLv3).