Some useful links - SmartArduino/SZDOITWiKi GitHub Wiki

DOIT: www.doit.am

esp-open-sdk: https://github.com/pfalcon/esp-open-sdk

NodeMCU: https://github.com/nodemcu/nodemcu-firmware

esp-open-rtos: https://github.com/SuperHouse/esp-open-rtos

ESP8266_RTOS_SDK: https://github.com/espressif/ESP8266_RTOS_SDK

ESP32_RTOS_SDK https://github.com/espressif/ESP32_RTOS_SDK

FreeRTOS: http://www.freertos.org/

esptool: https://github.com/themadinventor/esptool

GDBSTUB: https://github.com/espressif/esp-gdbstub

Unofficial Development Kit for Espressif ESP8266: http://programs74.ru/udkew-en.html

lua: www.lua.org

elua: www.eluaproject.net