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.

Greenboard - Generate beautiful static api documentation

Kajero - Interactive JavaScript notebooks - create good-looking, responsive, interactive documents.

Archbee.io - Archbee is a developer-focused product docs tool for your team. Build beautiful product documentation sites or internal wikis/knowledge bases to get your team and product knowledge in one place.

BeakerX - Open Source Polyglot Data Science Tool

You Need A Wiki - Create a wiki with Google Docs