Sphinx

Sphinx is a high-performance documentation generator that transforms reStructuredText or Markdown into intelligent, cross-referenced technical manuals.

Sphinx serves as the standard for Python documentation and powers major repositories like SQLAlchemy, Django, and the Linux kernel. It manages complex indexing and hierarchical structures with ease, producing searchable HTML, LaTeX (for PDF), and ePub outputs from a single source. The tool integrates directly with source code through extensions like autodoc: this automates the creation of API references to keep technical debt low and accuracy high.

https://www.sphinx-doc.org/