JS Bin has been built initially by @rem & friends to inspire teaching and debugging of HTML/CSS while maintaining focus on Javascript. I use this tool daily, it allows to collaborate in real-time, so I can teach the basics of web development through Skype with ease.
My favourite features are:
- the ability to easily enable and disable panels
- the live auto-reload
- support for emmet html coding
- jslinter
I know there are a lot of other solutions to achieve code sharing and debugging, just browse stackoverflow to realise it, but the quality of jsbin is in my opinion undefeated to date.
Toolhouse