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.
Observable Notebooks - The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.
iPython - iPython provides a rich toolkit to help you make the most out of using Python interactively.
BeakerX - Open Source Polyglot Data Science Tool
Docbase - Render your markdown documentation into beautiful sites
PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...