Doxygen is a tool for building documentation for source code e.g. inter-related HTML pages for C++ source code.
Doxygen can be loaded with:
module load Doxygen/1.8.15-GCCcore-8.2.0
NB Doxygen has a run-time dependency on
libstdc++ so the above also needs to
(and does) load the GCC compiler version 8.2.0.