Doxygen
Doxygen is a documentation generator tool that automatically produces reference documentation from annotated source code in various programming languages, such as C++, C, Java, and Python. It extracts comments and code structure to create formatted documentation in multiple output formats, including HTML, LaTeX, and RTF. It is widely used to maintain up-to-date API documentation for software projects.
Developers should learn Doxygen when working on large or collaborative projects where clear, consistent documentation is essential for maintainability and onboarding. It is particularly valuable for C++ and C projects, as it handles complex language features well, and for generating documentation from code comments without manual updates. Use cases include open-source libraries, enterprise software, and any project requiring automated API documentation.