This tool is used to convert PCB drilling file to G-Code to execute it on CNC milling machines.
I tried to write a minimalistic G-Code which could be understood by almost any CNC machine, i've tested it with LinuxCNC and MACH3.
It has a simple configuration file drl2gcode.ini containing some parameters of your mill such as feed, safe Z, spindle speed, spindle commands etc.
Adapt it to your machine and run ./drl2gcode [your_drl_file]. The result will be in output.ngc file.