A development kit for NodeMCU firmware.
It will make NodeMCU more easy. With a micro USB cable, you can connect NodeMCU devkit to your labtop and flash it without any trouble, just like Arduino.
It is an open hardware, with ESP-12 core (4MBytes flash version).
Pin map with ESP-12.
It is designed by Altium Designer, and fully opensource. Now everyone can made your own NODEMCU.