Zeta Debugger is a stand-alone source level debugger and code profiler for Windows 98/2000/XP applications written in C/C++ or assembly languages. Source level debugging is allowed when symbolic debug information emited by your compiler is one of those supported by our debugger or external plug-in modules. Otherwise, when this information is absent or not recognized, you can only debug at machine level.

Platform:Windows                 License:unknown

Reference:https://www.fyzor.com/debugger/index.htm

GDB, 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.

Platform: Cross platform                    License:unknown

Reference:https://www.gnu.org/software/gdb/

Nemiver is an on-going effort to write a standalone graphical debugger that integrates well in the GNOME desktop environment. It currently features a backend which uses the well known GNU Debugger gdb to debug C / C++ programs.

Platform:unknown                                                                    License:unknown

Reference:https://projects.gnome.org/nemiver/