ddd: Data Display Debugger ddd: ddd: DDD is a graphical front-end for command-line debuggers such as GDB, ddd: DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, or the Python ddd: debugger. Besides "usual" front-end features such as viewing source ddd: texts, DDD has become famous through its interactive graphical data ddd: display, where data structures are displayed as graphs. ddd: ddd: ddd: ddd: