I have just discovered Plunker. “Plunker is an online community for creating, collaborating on and sharing your web development ideas.
- Real-time code collaboration
- Fully-featured, customizable syntax editor
- Live previewing of code changes
- As-you-type code linting
- Forking, commenting and sharing of Plunks
- Fully open-source on GitHub under the MIT license”
If you are doing web development, you might want to have a look at it. – http://plnkr.co/