Open-source alternatives to Gcodeplot

CNCjs is a full-featured web-based interface for CNC controllers running Grbl, Marlin, Smoothieware, or TinyG.

svg2gcode A command line utility for converting SVG to Gcode using Gcanvas and canvg.

Grbl is a CNC motion control firmware and G-code parser designed for milling machines. It serves as a hardware control layer running on ATmega328 microcontrollers to translate G-code instructions into precise motor movements. The system manages stepper motor acceleration and coordinated multi-axis motion to drive milling hardware. It includes a tool probing system for automating workpiece alignment and calculating tool length offsets, as well as homing cycles that use limit switches to establish a precise coordinate origin. The firmware covers broader machine management including spindle and

Morgan Thibert -- 2019 -- Library for Processing 3

GCode interpreter and simulator for node.js