Observable - Interactive code examples/posts
CodeMonkey - Learn to code. Eat Bananas. Save the World.
nbviewer.org - Rackspace server host Jupyter Notebooks from your github repo
StackHive - Design, develop or publish websites right from your browser
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.
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.