Markdown Here - Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render...
Observable Notebooks - The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
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.
The Most Dangerous Writing Prompts - Don't stop typing, or all progress will be lost.
BeakerX - Open Source Polyglot Data Science Tool