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Observable - Interactive code examples/posts
SmallDevTools - Handy developer tools with a delightful interface
nbviewer.org - Rackspace server host Jupyter Notebooks from your github repo
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
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.
TextLab - TextLab is the fastest way to format, prettify, transform, hash, encode, and decode your data instantly!