wifi - Issue while connecting ESP8266 with Arduino Mega. It always says “Module have no response.” - Arduino Stack Exchange
Wemos Mega (ATmega2560+ESP8266)
WiFi R3 ATmega2560+ESP8266 32Mb memory USB TTL CH340G. Compatible for Arduino Mega NodeMCU For WeMos ESP8266|Integrated Circuits| - AliExpress
Mega2560 Atmega16u2 / Pro Mini Mega 2560 Mega+wifi R3 Atmega2560 Chip Ch340g For Arduino Mega R3 Development Board Wemos Esp8266 - Buy Mega2560,Atmega16u2,R3 Development Board Wemos Esp8266 Product on Alibaba.com
Wemos Mega +WiFi R3 ATmega2560+ESP8266 USB-TTL For Arduino Mega NodeMCU | eBay
Arduino Mega 2560 R3 Compatible with ESP8266 WiFi MCU and 32 Mb flash — PMD Way