M marimo (acquisition by CoreWeave announced October 2025) · Notebooks & interactive computing
Reactive Python notebook stored as a plain .py file that re-runs dependent cells automatically and doubles as a script or web app
Apache-2.0 Open source Free Local Self-hosted Nov 2, 2026PJ 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, 2026RI Posit Software, PBC · Mathematical & statistical computing
Posit's open-source integrated development environment for R, with console, editor, plots, environment panes, Quarto/R Markdown authoring and Python via reticulate
AGPL-3.0-only Free Open source Local Self-hosted Nov 2, 2026