Doxygen

It reads source‑code comments and extracts information about classes, functions, variables, and other symbols, then produces documentation automatically. The tool supports a wide range of languages, including C++, C, Python, Java, and many others, and can output the results in formats such as HTML, PDF (via LaTeX), Word (RTF), and XML. Users can embed Markdown alongside Doxygen’s own commands to enrich the text.

The generator creates cross‑references and hyperlinks that let readers navigate between related symbols, and it can produce diagrams of class hierarchies and collaborations for visual insight. A configurable Doxyfile lets projects tailor inclusion rules, output choices, and other options to fit their workflow.

Because it is free, open‑source, and works on multiple platforms, it is commonly adopted by development teams that need consistent, maintainable documentation across diverse codebases.