ESP8266 Arduino Wifi Shield for Windows - Hackster.io
Uno+wifi R3 Atmega328p+esp8266 Ch340 (32mb Memory) 6v-9v Usb-ttl Ch340g For Arduino Nodemcu Wemos One Development Board - Integrated Circuits - AliExpress
Amazon.com: HiLetgo 1PC ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small) : Electronics
Amazon.com: ESP8266 ESP-01S NodeMCU Development Board, CH340, WiFi Module, for Arduino : Electronics
ESP8266 attached to an Arduino Leonardo
Esp8266 Esp-07 Wifi Module V1.0 4 Pin Ttl Serial Uart Port Controller With 2.4ghz Ipex Antenna For Arduino - Integrated Circuits - AliExpress
ESP8266 Setup Tutorial using Arduino
Connecting ESP8266 with Arduino Uno - WiFi shield not present - Arduino Stack Exchange
Amazon.com: HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Large) : Electronics