You have also AsciiDoctor ( https://asciidoctor.org/ https://asciidoctor.org/ ) which is alive and well. I am using it for technical CS documentation internally

You have also AsciiDoctor ( https://asciidoctor.org/ https://asciidoctor.org/ ) which is alive and well. I am using it for technical CS documentation internally, but only for single page documents. I did not try to deploy their whole multi-document setup called Antora ( https://antora.org/ https://antora.org/ ).