I've been tasked to help teach my nephews and niece with learning how to code.

So far, I've looked into www.code.org, https://kano.me/, http://www.robotturtles.com/, and https://scratch.mit.edu/.

What are some other good resources that I can use to work with the kids? I'm open to all suggestions- online, offline, free, OSS, paid, subscription, etc.

Thanks!