GRLD stands for Graphical Remote Lua Debugger:

GRLD is free of charge for non-commercial applications only. See the download section for more details. Source code is available because I believe users must be able to adapt the tools they use to their specific needs. However, GRLD is not open source, you are not allowed to redistribute it. If you want to contribute improvements, bug reports, or bug fixes, please contact me.

You can support the development of this lua debugger by buying commercial product keys, or make a donation.