Xffm is integrated by Edscott Wilson Garcia but 
made possible thanks to the contribution of many developers

(in alphabetical order):

Alan Cox <alan@lxorguk.ukuu.org.uk>
Albert Chin <china@thewrittenword.com>
Benedikt Meurer <Benedikt.Meurer@unix-ag.uni-siegen.de>
Bernhard Walle <Bernhard.Walle@gmx.de>
Ben Hall <bhall@chat.carleton.ca>
Biju Chacko <botsie@myrealbox.com>
Bill Witherspoon <billw@witherspoon-design.com>
Bruno Haible  <haible@clisp.cons.org>
Chuck Mead <csm@redhat.com>
Damon Chaplin <damon@ximian.com>
Danny Milosavljevic <danny.milo@gmx.net>
David MacKenzie
Dmitry DELTA Malykhanov <d726f6e@sdf.lonestar.org>
donLouis Parochelli <papaindia@earthlink.net>
Edscott Wilson Garcia <edscott@users.sourceforge.net>
Guido Draheim <guidod-2002-@gmx.de>
H.R. ter Veer <terveer@subdimension.com>
Igor A. Skachko <iskachko@mail.ru>
Jacob Berkman <jacob@ximian.com>
Jasper Huijsmans <huysmans@users.sourceforge.net>
Jean-François Wauthy <pollux@lunar-linux.org>
Jens Luedicke <jens@irs-net.com>
Jim Meyering  <meyering@lucent.com>
Joakim Andreasson <joakim.andreasson@gmx.net>
Joe Klemmer <klemmerj@webtrek.com>
K. Prasad <mvkp@yahoo.com>
manny rosa <manny_robot_freak@yahoo.com>
Martijn van Beers <martijn@earthling.net>
MaT <mat@razdva.cz>
Neal <runzlinux@yahoo.com>
Olivier Fourdan <fourdan@xfce.org>
Paul Eggert  <eggert@twinsun.com>
Peeter Vois <Peeter.Vois@mail.ee>
Rasca Gmelch <thron@gmx.de>
Richard Stallman
Staszyszyn, Marcin <mstaszyszyn@heiler.com>
Stephane Gibier <sgibier@mail.dotcom.fr>
Stephane Paltani <spaltani@head-cfa.harvard.edu>
Venkatesh K S <ksv77@lycos.com>

and the icon guys at gnome and kde,
and the Free Software Foundation, Inc.
and the Open Source Development Network, Inc.
and all those I forgot to mention (sorry)