Book
It is now much easier to write a technical book. There are some convenient tools to convert Markdown documents or Jupyter notebooks into a book.
It seems like as of now (2021), the Bookdown seems to be the best.
- https://jupyterbook.org/intro.html (jupyter project)
- https://github.com/rust-lang/mdBook (Rust)
Custom book examples
Book platforms
- https://bookish.press