Umbrello UML Modeller is the work of many people.
Some of the contributors are listed at:
 http://uml.sourceforge.net/developers.php

If you find any problems or want features added please request or vote
for them at http://bugs.trinitydesktop.org and consider implementing the feature
yourself, all contributions are very welcome.

Some ideas for people wanting to contribute to Umbrello:
 http://uml.sourceforge.net/junior-jobs.php

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People who have contributed to Umbrello:
(Please contact uml-devel if we have forgot you)

Marcus Alanen <maalanen @ra.abo.fi>
Danny Allen <dannya40uk @yahoo.co.uk>
Laurent Bardi <laurent.Bardi @ipbs.fr>
Zoltan Bartko <bartko.zoltan @pobox.sk>
Luis De la Parra Blum <lparrab @gmx.net>
Raymond Bosman <bosman @hetnet.nl>
Clarke Brunsdon <clarke @vossoc.org>
Ben Burton <bab @debian.org>
Albert Cervera <albertca @jazzfree.com>
Albert Astals Cid <tsdgeos @terra.es>
Richard Dale <duke @tipitina.demon.co.uk>
Vincent Decorges <vincent.decorges @eivd.ch>
Antoine Dopffer <adopffer @nerdshack.com>
Alan Ezust <alan.ezust @gmail.com>
Jean-Remy Falleri <jr.falleri @gmail.com>
Andi Fischer <andi.fischer @hispeed.ch>
Pascal Fleury <fleury @users.sourceforge.net>
JP Fournier (jfournier121 @rogers.com)
Gregorio Guidi <g.guidi @sns.it>
Jose Gutierrez <joseg @mapasysistemas.com.ar>
Esben Mose Hansen <esben @despammed.com>
Olaf Hartig <OleBowle @gmx.de>
Marius Helf <marius.helf @gmx.de>
Paul Hensgen <phensgen @bigpond.net.au>
Michel Hermier <michel.hermier @wanadoo.fr>
Harald Herres <harald.herres @control.de>
David Hugh-Jones <hughjonesd @yahoo.co.uk>
Pekka Jääskeläinen <pjaaskel @cs.tut.fi>
Klas Kalass  <klas.kalass @gmx.de>
Oliver Kellogg <okellogg @users.sourceforge.net>
Kleag (kleag @free.fr)
Tobias Koenig <tokoe @kde.org>
Piotr Kolaczkowski <P.Kolaczkowski @elka.pw.edu.pl>
Matthias Kretz <kretz @kde.org>
Thorsten Kunz <tk @bytecrash.net>
Dmitry N. Kurashkin <dkur @nm.ru>
Jari-Matti Mäkelä <jmjm @iki.fi>
Gustavo Madrigal <gmadrigal @nextphere.com>
martin <mv123q3 @hotmail.com>
Rene Meyer <Rene.Meyer @sturmit.de>
Laurent Montel <montel @kde.org>
Yan Morin <yansanmo.site @gmail.com>
Tom Morris <tfmorris @gmail.com>
Lutz Mueller <lutz.mueller @gmx.de>
Heiko Nardmann <heiko.nardmann @onlinehome.de>
Dimitri Ognibene <ognibened @yahoo.it>
Michael Palomas <mpalomas @gmail.com>
Anthony Parent <anthony.parent @intel.com>
Carsten Pfeiffer <pfeiffer @kde.org>
Ivan Porres <iporres @abo.fi>
Maciej Puzio <maciek @work.swmed.edu>
Ruediger Ranft <kdebugs @rranft1.mail.htwm.de>
Sharan Rao <sharanrao @gmail.com>
John Ratke <jratke @comcast.net>
Vincent Ricard <magic @magicninja.org>
Daniel Richard G. <skunk @iskunk.org>
Jonathan Riddell <jr @jriddell.org>
Peeter Russak <pezz @tkwcy.ee>
Paulo Roberto Rodriguez Sehn <paulo.sehn @gmail.com>
Daniel Calviño Sánchez <danxuliu @gmail.com>
Leo Savernik <l.savernik @aon.at>
Peter Soetens <peter.soetens @mech.kuleuven.ac.be>
Achim Spangler <Achim.Spangler @mnet-online.de>
Sebastian Stein <seb.stein @gmx.de>
Andrew Sutton <asutton @cs.kent.edu>
Tanuj <tagrawal @hss.hns.com>
Tonton <tonton-lists @team1664.org>
Brian Thomas <brian.thomas @gsfc.nasa.gov>
Ferenc Veres <lion @netngine.hu>
Jean Vittor <jean.vittor @wanadoo.fr>
Egbert Voigt <Egbert.Voigt @alcatel.de>
Stefan Walter <sw @gegenunendlich.de>
Jeremy Wickersheimer <jwickers @gmail.com>
Yurgen Wolfgang <raptorsforever @softhome.net>
Maciej J. Woloszyk <mat @esi.com.pl>
Tobias Wulff <Tobias-Wulff @codeeye.de>