NodeMcu -- An open-source firmware based on ESP8266 wifi-soc.
https://www.nodemcu.com/index_en.html
The Development Kit based on ESP8266, integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board. Power your development in the fastest way combined with NodeMcu Firmware!
NodeMCU - Wikipedia
https://en.wikipedia.org/wiki/NodeMCU
NodeMCU is a low-cost open source IoT platform. It initially included firmware which runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which was based on the ESP-12 module. Later, support for the ESP32 32-bit MCU was added.
Overview - NodeMCU Documentation
https://nodemcu.readthedocs.io/
NodeMCU Documentation¶. NodeMCU is an open source Lua based firmware for the ESP8266 WiFi SOC from Espressif and uses an on-module flash-based SPIFFS file system.
NodeMCU custom builds
https://nodemcu-build.com/
NodeMCU custom builds. You customize your NodeMCU firmware and we build it. Just for you. Keep an eye on your spam folder or allow emails from nodemcu-build.com explicitly.
NodeMCU - Home | Facebook
https://www.facebook.com/NodeMCU/
NodeMCU. 4,142 likes · 7 talking about this. NodeMCU is the Lua-based interactive firmware for ESP8266/ESP8255 plus two devkits.
GitHub - nodemcu/nodemcu-firmware: Lua based interactive firmware...
https://github.com/nodemcu/nodemcu-firmware
NodeMCU 3.0.0 A Lua based firmware for ESP8266 WiFi SOC Summary LFS support Programming Model Documentation Releases Support License.