1.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+68 starsfrom 6,247 · score 4.23
2.s00500 / ESPUIA simple web user interface library for ESP32 and ESP8266iotesp32arduinoarduino-librarywebinterfacejavascript+13 moreC++Other license1.1K total207 forks+16 starsfrom 1,118 · score 2.83
3.yoursunny / WifiEspNowESP-NOW Arduino library for ESP8266 and ESP32esp8266esp32esp-nowarduino-libraryhacktoberfestC++Other license296 total48 forks+3 starsfrom 293 · score 1.39
4.adafruit / Adafruit_IO_ArduinoArduino library to access Adafruit IO from WiFi, cellular, and ethernet modules.adafruit-ioarduinoarduino-libraryC++Other license224 total109 forks+1 starsfrom 223 · score 0.69