Jupyter Notebook tree (front page) extension that lets you connect to existing kernels. An ssh tunnel can be automatically created for non-local kernels but for now the host with the kernel must be visable from the host of the notebook and either a) accessible with passwordless ssh or b) accessible via munge rsh to the kernel host and passwordless ssh back to the notebook host.
(out-of-date)
pip install .Distributing Jupyter Extensions as Python Packages - Server Extension
Custom request handlers - Writing a notebook server extension