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Reminds me of http://www.coderun.com which supports C#, PHP, JavaScript, HTML and CSS. (and is free)

I'm curious to know what I get for this paid version? Is it mostly the Git support?

A difference is that we support actual step through debugging for javascript. Indeed git support is another differentiator. Our Git UI will be released shortly too. We have a pluggable architecture to very easily extend cloud9 with new features. We are working with many developer oriented companies to add their services and tooling to Cloud9. Our aim for Cloud9 is to provide a full PaaS for software development in the cloud.

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