What is Gar2ped? how to get it whether it is a free ware or not and kindly give me some suggestion for how to give input to gar2ped and how to get output using it
It is a software for the analysis of the normal modes in terms of internal coordinates, which contribution in a given normal mode is determined based on the potential energy distribution (PED) among the internal coordinates.
It can show you which vibrations of which molecular fragments are energetically the most important contributors to the normal coordinates, which are of course delocalized over the whole molecule.
It is free to download (e.g. from http://www.ccl.net/cca/software/SOURCES/FORTRAN/gar2ped/index.shtml), although you should cite its authors in your publications.