gnat, gnatbind, gnatbl, gnatchop, gnatfind, gnatkr, gnatlink, gnatls, gnatmake, gnatprep, gnatpsta, gnatpsys, gnatxref − GNAT toolbox
Those programs are part of GNU GNAT 4.1, a freely available Ada 95 compiler.
For accessing the full GNAT manuals, use info gnat-ug-4.1 and info gnat-rm-4.1 for the sections related to the reference manual. If those sections cannot be found, you will have to install the gnat-3.4-doc package as well.
This manpage has been written by Samuel Tardieu <sam AT debian DOT org>, for the Debian GNU/Linux project.