Useful websites for learning coding 

（1）code academy

https://www.codecademy.com

（2）OSS University：Path to a free self-taught education in Computer Science!

https://ossu.firebaseapp.com/#/

（3）Coding online

https://c9.io/login

(4)Javascript advanced

https://jsfiddle.net/

(5)opensource code platform

https://github.com/

 (6)Child coding

http://appinventor.mit.edu/explore/

https://scratch.mit.edu/

(7)

将github地址映射为可运行的py notebook: https://mybinder.org/

NLU open API and platform

(1)facebook NLU API

  https://wit.ai/

(2)google NLU API

  https://api.ai/

(3)MS NLU API

  https://www.luis.ai/

Teaching assistant:

https://www.socrative.com/