How does this compare with Cloud9? https://github.com/ajaxorg/cloud9/
However we have a big emphasis on modularity, ease of use. We have a Desktop app (linux/mac) coming in the pipes.
Our cloud version has offline support (so you can code even when the network cuts).
And a handful of other things. For example our hosting platform supports stacks (swappable VM images), that allow us to provide our clients with tailored environments to suit their needs (languages & frameworks they use).
Overall Codebox & Cloud9 are both interesting projects. And the Cloud9 team has definitely built some interesting stuff as well.
Thank you for keeping your source open. Interesting to poke around in the internals.