[flaminglunchbox]

There are some. Bespin is now merged into ace and cloud9 is the actual full-featured (has someplace to save without further integeration) implementation. And cloud9 is sadly not free for non open source projects. I find that they aren't satisfactory for my everyday use.

[davidbanham]

Running cloud9 on their hosting isn't free for non open source projects, but you're welcome to download the source from GitHub and install it on your own server.