- xfce, xfclock, xfbd, xfmouse & xfsound are written by :
  Olivier Fourdan (fourdan@xfce.org)

- xftree is based on xtree (C) Rasca Gmelch :
  Rasca Gmelch <thron@gmx.de>

- xfglob and xfdiff are contributed by :
  Edscott Wilson Garcia <edscott@imp.mx>
  
- xfmenu (GNOME and KDE menu loader) is contributed by :
  Jasper B. Huijsmans <J.B.Huijsmans@chem.rug.nl>

- xfbdmgr (backdrop list manager) is from :
  Alex Lambert <alex@penwing.uklinux.net>

- xfwm and xfpager are originally based on fvwm and fvwm2 from :
  Robert Nation
  Charles Hines

- xfgnome is based on Gnome module for Afterstep by :
  Rafal Wierzbicki <rafal@mcss.mcmaster.ca>

- xfce theme engine is based on original GTK+ themes, Notif theme 
  (by Owen Taylor and The Rasterman) and Notif2 theme by Roberto 
  Machorro.

Patches contributed by (in no special order)

- Guido Draheim <guidod@gmx.de>
- <anubis@dotd.mudservices.com>
- Adam Sampson <azz@gnu.org>
- Albert Chin-A-Young <china@thewrittenword.com>
- Yamahata Kenichiro <mogutan@din.or.jp>
- Beau Kuiper <ekuiperba@cc.curtin.edu.au>
- Joakim Andreasson <karanne@flashback.net>
- Francois Petitjean <francois.petitjean@bureauveritas.com>
- Khadiyd Idris <khadx@francemel.com>
- Daniel McSorley <mcsorley@cis.ohio-state.edu>
- Jason Litowitz <jlitowitz@visto.com>
- Lorenz Minder <lminder@gmx.net>
- Ruediger <ruediger@gmx.net>
- J.B. Huijsmans <j.b.huijsmams@chem.rug.nl>
- M. Roxo da Motta <roxo@conectiva.com.br>
- Ingo "LaSombra" Hoffmann <lasombra@terra.com.br>
- Petr Blaha <pblaha@suse.cz>
- Chuck Mead <csm@moongroup.com>
- Giancarlo Rosso <gianca.rosso@katamail.com>
- David Weber <david_weber@gmx.de>
- Peeter Vois <Peeter.Vois@mail.ee>
- Martin Pekar <cortex@nextra.sk>
- Ken Sodemann <stufflehead@bigfoot.com>
- Joerg Koenig <J.C.koenig@t-online.de>
- Victor Meghesan <meghesan@usa.net>
- Damien <damien@mandrakesoft.com>
- Joakim Andreasson <karanne@flashback.net>
- Josip Rodin <joy@cibalia.gkvk.hr>
- Daniel Statescu <Daniel.Statescu@bigfoot.com>
- Myckel Habets <myckel@superweb.nl>
- Roy Culley <tgdcuro1@gd2.swissptt.ch>
- Ramón Flores d'as Seixas <fa2ramon@usc.es>
- Thomas Jaeger <jaeger@mathematik.tu-darmstadt.de>
- Carlo Corridore <Carlo@alenianola.finmeccanica.it>
- Rui Fernando A. Silva, <ruifs@teleweb.pt>
- Harm ter Veer <terveer@subdimension.com>
- Stephane Paltani <spaltani@cfa.harvard.edu>