Doxygen

Doxygen is a documentation tool for C, C++, Java and other C like languages. Unfortunately it does not support Perl (yet, I hope).

Its basic idea is completely stolen from JavaDoc. Meanwhile, Doxygen generates better output in HTML and also generates LaTeX, RTF, man and XML. And more, if you have graphviz installed, Doxygen will create graphs of module dependencies and data structures hierarchy.

If you have to document your C or C++ tool a really suggest you to give a look into this nice tool.