GNU Data Display Debugger is described as 'DDD 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' and is an app in the Development category. There are nine alternatives to GNU Data Display Debugger for Linux, Windows, Mac, Microsoft Visual Studio and Tcl. The best alternative is Nemiver, which is both free and Open Source. Other great apps like GNU Data Display Debugger are VisualGDB (Paid), wingdb (Paid), GDBFrontend (Free) and Affinic Debugger GUI (Freemium).
Affinic Debugger GUI .aka. ADG, is designed as a graphical user interface for various debuggers. With the graphical windows, ADG can unleash the full power of debuggers by viewing multiple types of information within one view and maneuvering debuggers with easily clicking.
Gede is a graphical frontend (GUI) to GDB written in C++ and using the Qt5 or Qt4 toolkit. Gede can be compiled on (all?) Linux distributions and on FreeBSD. Gede supports debugging programs written in Ada, FreeBasic, C++, C, Rust, Fortran and Go.