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