Exuberant Ctags generates an index (or tag) file of source language
objects in source files that allows these items to be quickly and
easily located by a text editor or other utility.

Alternatively, it can generate a cross reference file which lists,
in human-readable form, information about the various objects found
in a set of source code files.

Supported languages include: C, C++, Java, Eiffel, FORTRAN.

WWW:    http://fly.hiwaay.net/~darren/ctags/