Goouuu-S1 ESP8266
This is an ESP8266 based board, in case you buy one of these here is some info I have found
Goouuu-S1 ESP8266 WiFi module is...
Wemos D1 ESP8266 based board
The wemos d1 is an Arduino Uno-like wifi board based on ESP-8266EX. You can use the Arduino IDE, NodeMCU and there are other development...