GRBLDuino Uno Lite - GRBL 1.1 CNC Controller from The Eccentric Workshop on Tindie
GRBL HotWire Mega 5X for CNC Foam Cutters - rcKeith
GitHub - dguerizec/grbl-Mega-4axis: An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560