Source code documentation generator tool.
Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors) and to some extent PHP, C#, and D.
http://www.stack.nl/~dimitri/doxygen/
George Petasis: There is a small flex tool than act as a doxygen filter, to generate documentation with doxygen from tcl files. It can be found at [L1 ]