Nice list! I've also used [nimibook](https://pietroppeter.github.io/nimibook/).

Its a port of mdbook to Nim, but also extends it with the ability to generate interactive content as well using Nim's Javascript backend. Though I haven't tried this piece myself I like the idea of an all in one way to make interactive elements when desired: https://pietroppeter.github.io/nimib/interactivity.html