PJ Project Jupyter (NumFOCUS) · Notebooks & interactive computing
In-depth entry Open-source computational notebook ecosystem: the .ipynb format, kernels for Python, R and Julia, JupyterLab and Notebook interfaces and JupyterHub
BSD-3-Clause Open source Free Local Self-hosted Nov 2, 2026P Python Software Foundation · Programming languages & runtimes
In-depth entry General-purpose, dynamically typed programming language with a large standard library and the dominant ecosystem for data science and machine learning
PSF-2.0 Open source Free Local Self-hosted BrokenQ Posit Software, PBC · Academic writing & publishing
In-depth entry Open-source scientific publishing system from Posit that renders Markdown with executable Python, R, Julia or Observable code to HTML, PDF, Word, slides, websites and books via Pandoc
MIT Free Open source Local Nov 2, 2026