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marimo

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-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Observable

Observable, Inc. · Notebooks & interactive computing

JavaScript data notebooks and the open-source Observable Framework static-site generator for data apps, from the maintainers of D3 and Plot

ISCFreemiumPaidLocalNov 2, 2026

Project Jupyter

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-ClauseOpen sourceFreeLocalSelf-hostedNov 2, 2026

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