Antora is described as 'A static site generator for creating documentation sites from AsciiDoc content aggregated from multiple repositories. Made by the creators of Asciidoctor' and is an app in the Development category. There are more than 25 alternatives to Antora for a variety of platforms, including Self-Hosted solutions, Linux, Mac, Windows and npm. The best alternative is GitBook, which is free. Other great apps like Antora are Read The Docs (Free, Open Source), Sphinx (Free, Open Source), MkDocs (Free, Open Source) and Daux.io (Free, Open Source).