Based on our record, Starboard.gg seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Creating something in the scope of Jupiter is not trivial. In any case, maybe creating something for the browser only because JS is native is easier (but still I won't call it "pretty trivial"). For this you have projects like https://starboard.gg/. - Source: Hacker News / about 1 year ago
However, I came across https://starboard.gg/ as a free open-source alternative and have to say it looks great. Source: over 1 year ago
You might like Starboard Notebook (https://starboard.gg), it's in-browser and mixed multi-language, as well as diffable/version control friendly. (I'm building it). https://starboard.gg. - Source: Hacker News / over 2 years ago
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.
Observable - Interactive code examples/posts
iPython - iPython provides a rich toolkit to help you make the most out of using Python interactively.
Kajero - Interactive JavaScript notebooks - create good-looking, responsive, interactive documents.
Observable Notebooks - The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.
BeakerX - Open Source Polyglot Data Science Tool