D1 Mini WiFi Development Board – Addicore
NodeMCU ESP8266 Pinout, Specifications, Features & Datasheet
ESP-8266 Modules — Zephyr Project Documentation
How to Use Wired Communication with an ESP8266
ESP8266 WiFi Module - Pinout, Specifications
Remote Control Using an ESP8266 Wireless Module : 13 Steps (with Pictures) - Instructables
Introduction & Programming of the ESP8266 NodeMCU Board
3 Simple Ways of Programming an ESP8266 12X Module
Adafruit HUZZAH ESP8266 Breakout
WiFi Module - ESP8266 (4MB Flash)
NodeMCU Lua V3 ESP8266 WIFI with CH340C
ESP8266 Pinout, Datasheet, Features & Applications - The Engineering Projects
ESP8266 ESP-01 WiFi Module - ProtoSupplies
Products
Flashing The Official ESPRESSIF Firmware in ESP8266 !!!, by J3, Jungletronics
ESP8266 NodeMCU: Erase Flash Memory (Factory Reset)
SparkFun ESP8266 Thing
ESP8266 with Arduino IDE: Beginner's Guide to IoT Development
Diymore NodeMCU ESP8266 Development Board with 0.96 Inch OLED Display, CH340 Driver Module for Arduino IDE/Micropython Programming
ESP8266 first project: home automation with relays, switches, PWM, and an ADC, by R. X. Seger