Any system to write code with multiple users online in real time like a shared google docs?

Is there any free system to write code with multiple users online in real time like a shared google docs? Google docs would work just fine for us if only it could do some color-highlighting.

I开发者_JAVA技巧deas? Thanks

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Similar ground covered here: https://stackoverflow.com/questions/1873780/best-editor-for-remote-pair-programming

..and here: https://superuser.com/questions/10088/google-docs-syntax-highlight

..and here: Is there any IDE or Source Control System inspired by Google Docs collaborative mode?

I hope one of the above helps! N

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Mozilla Skywriter (unfortunately far down in the answers of Nick Cartwright's linked question) should meet the criteria.