Jupyter Notebook is already free and open source, and it remains the standard for interactive Python/data science work. What it doesn't give you out of the box is built-in real-time collaboration, SQL blocks, or a hosted multiplayer experience — teams that want those on top of the notebook format usually add a layer on top of Jupyter or move to a Jupyter-compatible tool that bundles them in.
FAQ
Is there a free, open-source alternative to Jupyter?
Jupyter itself is open source. If you want the same notebook workflow with built-in collaboration and SQL support, Deepnote (Apache-2.0) is a Jupyter-compatible option.
What's the best open-source alternative to Jupyter?
Deepnote is worth a look if you want real-time multiplayer editing and SQL blocks alongside standard Python notebooks, rather than running Jupyter alone.
What are the top open-source alternatives to Jupyter?
Browse all open-source alternatives to Google Colab for more notebook platforms, or explore the full Developer Tools category.