Doxygen is described as 'Tool for generating documentation from annotated C++ sources, as well as other popular programming languages like C, Objective-C, C#, PHP, Java, Python, IDL (CORBA, Microsoft, and UNO/OpenOffice flavors), Fortran, VHDL, Tcl, and to some extent D' and is a popular documentation generator in the development category. There are more than 25 alternatives to Doxygen for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Web-based apps. The best Doxygen alternative is MkDocs, which is both free and Open Source. Other great apps like Doxygen are Sphinx, Quartz – Static Site Generator, Mintlify and VitePress.