The ESP Wi-Fi modules are microcontrollers with Wi-Fi and Bluetooth (not all models) capability, developed by Espressif Systems. It consists of many development boards like ESP8266-01, ESP8266, NodeMCU, ESP12, ESP32 etc. All the development boards can be easily programmed using Arduino IDE and can be used in a variety of applications like Home Automation, Internet of things (IoT), Smart devices etc.. The below list consists of a large collection of ESP8266 projects with circuit diagram, code and hardware demonstration. You can also check out the Arduino ESP8266 projects if you have to interface an ESP with Arduino board.