MicroPython on the ESP8266: beautifully easy IoT by Damien George » Getting the most out of ESP8266 (aka what MicroPython on ESP8266 is going to do) — Kickstarter
ESP8266 - Wikipedia
NodeMCU ESP8266 Pinout, Specifications, Features & Datasheet
ESP8266 WiFi Module - Espruino
ESP8266 ESP-01 WiFi Module - ProtoSupplies
ESP-03 Upgrade Flash Memory to 128 M Bit : 10 Steps - Instructables
NodeMCU Based ESP8266 Development Kit (With CP2012 Chip) - RAM Electronics