ESP8266 ESP-12E UART WIFI Wireless Shield TTL Converter for Arduino UNO R3 Mega | eBay
Esp8266 Esp-12e Uart Wifi Wireless Shield Development Board For Arduino Uno R3 Circuits Boards Modules One - Integrated Circuits - AliExpress
Help on unidentified board + Shield ESP8266 ESP-12E UART "moer" version - Project Guidance - Arduino Forum
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ESP8266-Based Serial WiFi Shield for Arduino Uno Connection problem - Installation & Troubleshooting - Arduino Forum
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ESP8285 WiFi DIP module replaces ATMega328P MCU on Arduino UNO board (Crowdfunding) - CNX Software
UNO R3 + WIFI ESP8266 + CH340G Arduino and WIFI single board - Hackster.io