This software comes with the CNC Milling & Engraving Machine sold by Leobot Electronics.  There are two programs included in the rar file. The LiteFire software is for laser engraving and the program simply named "GRBL" will let you do milling work. Both sets of software include some useful functions such as converting from normal image files to GRBL and NC/GO Files. 

 Download GRBL & Laser Engraving software here: https://leobot.net/3018.rar 

Also have a look at our Image-To-GCode convertor, developed by Leobot Electronics, to quickly convert images to gcode files for use with  MILLING:

https://leobot.net/viewproduct.aspx?id=5214