Enter a notebook filename:
About Notebook Exec and Gist Exec
Gist exec pairs gists through github.js and the Jupyter architecture to get compute dynamically. Notebookexec (the thing you are looking at) is a trimmed down version which loads notebooks from this webserver and then uses the Jupyter architecture to get compute dynamically. It only supports IPython/Jupyter notebooks.
There is no network access and operations are limited. If you find a bug, report it.
Hosting for the kernels is provided by developer.rackspace.com.