Reference Resources

https://github.com/grbl/grbl

http://www.linuxcnc.org/docs/2.5/html/gcode/gcode.html

Testing a Post-Processor : in your CAD/CAM Application, go to "Samples / Libraries" | "Post Processor Banchmarks". Open this file and post all operations and check for errors.

Blogpost about benchmark-test for post processors