ESP8266
- Manufacturor website DoIt.am
 - ESP-12E DevKit
 - Microcontroller.net - ESP8266
 
Node MCU
Introduction:
IDEs and Tools:
- LuaLoader - a windows tool
 - ESplorer - a GUI written in Java
 - NodeMCU-Tool - a node.js cmdline tool
 
Documentation:
Update and Flash:
- Build a nodeMCU image:
    
- nodemcu-build.com - build your own custom firmware in the cloud :-)
 - nodeMCU on github - build it yourself
 
 - Flash it:
    
- upgrade nodeMCU with nodemcu-flasher
 - wiki with flash instructions
 
 
Lua
Lua Webserver
Aduino
- Instructables - howto use aduino with the esp8266
 - esp8266 Aduino
 - Aduino - Getting started