Boostnote - Boostnote is an open-source note-taking​ app.

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.

Supernotes - The fastest way to take notes and collaborate with friends. Create notecards with Markdown, LaTeX, images, emojis and more. Get started for free!

Livebook - Automate code & data workflows with interactive Elixir notebooks

Draft - A tool for developers to create cloud-native applications on Kubernetes

Wolfram Language - Knowledge-based programming