GNU DDD - (Data Display Debugger) is a graphical front-end for command-line debuggers such as GDB, DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, the bash debugger bashdb, the GNU Make debugger remake, or the Python debugger pydb. Besides "usual".
Rogue Wave TotalView is the best debugging software, Faster fault isolation, improved memory optimization, and dynamic visualization for your high performance computing apps. TotalView for HPC is a scalable and intuitive debugger for parallel.
GDB is the best debugging software, the GNU Project debugger, allows you to see what is going on `inside' another program while it executes -- or what another program was doing at the moment it crashed. GDB is the best debugging software, the GNU.