Candle

Candle is a simple control application for Grbl-based CNC machines, especially common with small desktop mills. You can load, edit and save G-code, view the toolpath, send the job and monitor machine state, and jog with on-screen buttons, the numpad or console commands. Hardware requirements are low, so it also runs on older PCs and on a Raspberry Pi. Limitation: a fairly basic interface without the advanced wizards found in newer control programs.