Jovian Online Jupyter notebook
Microsoft Azure Notebooks : defunct
Codeocean : free for academia
Mito Mito is an editable spreadsheet in your Jupyter notebook. You can clean, filter, find/replace, and use standard spreadsheet functions in Mito, giving you the visibility and ease of a spreadsheet with the power of Python.
RISE : RISE allows you to instantly turn your Jupyter Notebooks into a slideshow. No out-of-band conversion is needed, switch from jupyter notebook to a live reveal.js-based slideshow in a single keystroke, and back.
GeoNotebook : A Jupyter notebook extension for geospatial visualization and analysis
nbinteract : Python package that provides a command-line tool to generate interactive web pages from Jupyter notebooks
Jupyterhub : Multi-user server for Jupyter notebooks
IPyCanvas : draw over Jupyter Notebook
Runkit Node-JS Notebooks (server side)
Polynote for Scala
Spark Notebook for Spark and Scala
R Notebooks : R