Dawit Alemayehu <adawit@earthlink.net>
KLineEdit, KComboBox

Espen Sand <espen@kde.org>:
KDialogBase, KAboutDialog (based on work by Mirko), KHelpMenu, KTextBrowser
and various adjustments here and there.

Daniel M. Duley <mosfet@kde.org>
Maintainer of KPixmapEffect, KStyle, KThemeStyle, and KThemeBase - as well as 
general misc coding here and there. 

Matthias Kalle Dalheimer <kalle@kde.org>:
classes KApplication, KConfig, KTextStream, KColorSet, 
automake, autoconf, maintenance

Richard Moore <moorer@cs.man.ac.uk>:
KLedLamp class, KNewPanner class.

Martynas Kunigelis <algikun@santaka.ktu.lt>:
KProgress class

Steffen Hansen <stefh@dit.ou.dk>:
KURL class

Torben Weis <weis@stud.uni-frankfurt.de>
DnD stuff, KSocket and KServerSocket classes, KPixmap

Alexander Sanda <alex@darkstar.ping.at>
Read and write numerical config entries, KPanner, KTabControl,
KPopupMenu, KMessageBox, KEdit widgets. 

Martin Jones <mjones@powerup.com.au>
Bugfixes in KPixmap and KURL, KColorDialog, KSelector
KColorButton

Keith Brown <kbrown@pdq.net>
KTreeList class

Bernd Johannes Wuebben <wuebben@math.cornell.edu>
KFontDialog class

Tim D. Gilman <tdgilman@best.com>
KDatePicker, KDateTable class

Nicolas Hadacek <hadacek@kde.org>
Key configuration classes, bug fixes

Christoph Neerfeld <Christoph.Neerfeld@mail.bonn.netsurf.de>
KIconLoader class

Sven Radej <sven.radej@iname.com>
KLineEdit, KCombo, KToolbar, KStatusBar

Rainer Bawidamann <Rainer.Bawidamann@wohnheim.uni-ulm.de>
Rubberbanding in KTreeList

Andre Fornacon <afo@fh-zwickau.de>
KSpinBox

Michael Wiedmann <mw@miwie.in-berlin.de>
KRestrictedLine, KIntegerLine

Matthias Ettrich <ettrich@kde.org> 
KWMModuleApplication, tearing/docking of ktoolbar and kmenubar, heavy
modifications to kbutton

Stephan Kulow <coolo@kde.org>
first versions of KTopLevelWidget and KToolBar, heavy modifications to
automake and autoconf

Joerg Habenicht <j.habenicht@europemail.com>
KLed class

Thomas Tanghus <tanghus@earthling.net>
Classes KNotebook and KWizard

Jorge Monteiro <jomo@casema.net>
KContainerLayout class

Kurt Granroth <granroth@kde.org>
KURLLabel class

Jörg Habenicht <habenich@kbs.uni-hannover.de>
KRuler class

Rene Beutler <rbeutler@iiic.ethz.ch>
Widget Identifying System

Maxim Judin <novaprint@mtu-net.ru>
created the Dockwidget class set

Falk Brettschneider <gigafalk@yahoo.com>
contributes for the Dockwidget class set

Holger Freyther <freyther@yahoo.com>
KDialogBase, KGuiItem, KStdGuiItem, KAction,
added KMessageBox::questionYesNoCancel( )