1.Klipper3d / klipperKlipper is a 3d-printer firmwareCGPL-3.012K total6K forks+106 starsfrom 11,922 · score 4.67
2.grbl / grblAn open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight ArduinoCOther license6.3K total3.2K forks+30 starsfrom 6,285 · score 3.43
3.luc-github / ESP3DFW for ESP8266/ESP8285/ESP32 used with 3D printerarduinoesp8266esp323d-printerfirmwarerepetier+6 moreCGPL-3.02K total498 forks+7 starsfrom 1,995 · score 2.08