Doxygen: Generating technical documentation

Doxygen is documentation system for modern languages: C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors), Fortran, VHDL, PHP, C#, and to some extent D.

Doxygen will generate documentation for you.

It could be useful on your own projects or on projects you are taking over and you don't know about: it will give you an idea about what's going on.

See Doxygen web site for more information.