Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
Observable Notebooks - The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.
Remote Duck - Stranger on the Internet that can help you debug your code
Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
Sublime Tutor - Learn Sublime Text from a tutor who sits inside the editor
BeakerX - Open Source Polyglot Data Science Tool