For questions related to GDB (The GNU Project Debugger) open source debugging software.
The GNU Project Debugger is open source debugging software that can perform both local debugging on host operating systems such as Linux and remote debugging on embedded targets such as ARM via a GDB server / supported JTAG debugger. It's commonly included as the debugger solution in development packages based around open source compilers such as GCC. Full documentation and downloads are available on the GDB project page.