Quarto

Homepage: Quarto.

If you are using pandoc to publish stuff, quarto might be a better wrapper for “books”. My interest was re-piqued because now they also support typst. In addition:

Quarto includes native support for Observable JS, a set of JavaScript enhancements created by Mike Bostock (the author of D3). Observable JS uses a reactive execution model, and is especially well suited for interactive data exploration and analysis.