I posted this before to this forum as a zip file but the code can now be accessed and downloaded via github.
https://github.com/CraigLindley/ESP8266Forth
I also wanted to let everyone reading this thread know that I've created the ESP8266Forth loader which opens a window onto ESP8266Forth streamlining code development. This Java program turns your PC into mass storage for your embedded system and allows for easy interaction with the target. Checkout the screen image and the readme file for details.
Have fun