GNU Project Debugger is described as 'Or gdb, is a command-line, source-level debugger for programs that were written in C, C++, D, Objective-C, Fortran, Java, Pascal, assembly, Modula-2, or Ada and compiled for any of a number of different target architectures including x86, x86-64, IA-64' and is a Decompiler in the development category. There are more than 10 alternatives to GNU Project Debugger for a variety of platforms, including Windows, Linux, Mac, BSD and Web-based apps. The best GNU Project Debugger alternative is Ghidra, which is both free and Open Source. Other great apps like GNU Project Debugger are IDA, radare2, OllyDbg and Cutter.