Nodejitsu, the original Node.js platform-as-a-service, has open-sourced several of its tools, some of which are used in its own production stack. These could be useful to those running their own Node.js servers or private clouds. Some of the tools are very simple, like forever, which ensures that a script runs continuously. Others are more involved, such as the application server haibu and the cloud deployment tool jitsu.
You can find all sort of Node.js goodness at Nodejitsu's GitHub.