Antora is an open-source, multi-repository documentation site generator designed for creating and maintaining technical documentation at scale. It enables organizations to author content as modular, reusable components using AsciiDoc and then assembles them into a unified, versioned documentation website. Antora supports content sourced from multiple repositories, allowing teams to manage documentation alongside code across different projects and versions, which streamlines collaboration and ensures consistency. With its focus on scalability, customization, and ease of integration, Antora is well-suited for producing comprehensive, maintainable documentation portals for complex software ecosystems.