Awesome
Basic Basic Interpreter from scratch especialy for the ESP8266.
http://www.esp8266basic.com/language-reference.html
http://www.esp8266basic.com/flashing-instructions.html
The libraries folder contains the libraries currently being used. Look at licence information for each.
Compile using the arduino ESP8266 package using the staging version 2.0.0-rc1
Special thanks to the people who have worked to extend and improve ESP BASIC. Contributers include MMiscool, Cicciob and Rotohammer.