Observable - Interactive code examples/posts
Chart.js - Easy, object oriented client side graphs for designers and developers.
nbviewer.org - Rackspace server host Jupyter Notebooks from your github repo
D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
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.
Google Charts - Interactive charts for browsers and mobile devices.