Observable - Interactive code examples/posts
Statically - The free optimization & CDN for images, CSS, JavaScript, and open source.
nbviewer.org - Rackspace server host Jupyter Notebooks from your github repo
jsDelivr - A free, fast, and reliable Open Source CDN for npm and GitHub with the largest network and best performance from all OSS CDNs. Serving 100 billion requests per month.
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.
raw.githack.com - raw.githack.com serves raw files from github.com with proper Content-Type headers (like rawgit.