Standard tool for generating documentation from annotated C++ sources

Doxygen
Free
Offline
http://www.stack.nl/~dimitri/doxygen/

Doxygen is the de facto standard tool for generating documentation from annotated C++ sources, but it also supports other popular programming languages such as C, Objective-C, C#, PHP, Java, Python, IDL (Corba, Microsoft, and UNO/OpenOffice flavors), Fortran, VHDL, Tcl, and to some extent D.