Code:
Jim Duchek: jim.duchek@gmail.com
License: GPLv3
http://www.gnu.org/licenses/gpl-3.0.html

Translations:
Chinese (Simplified): Dean Smith <xslidian@gmail.com>
Chinese (Traditional): Dean Smith <xslidian@gmail.com>
Spanish: Manuel Guerrero <manolonte@users.sourceforge.net>
Japanese: Yu Inao <apphis@youck.org>
French: Luc Patou <luc.patou@gmail.com>
Italian: Fry <fry@nerdsopolis.net>
German: David Liffmann <david.liffmann+googsystray@gmail.com>
Russian: Alex Dedul <rotmer@gmail.com>
Dutch: Leon Keijser <keijser@stone-it.com>
Hungarian: Szabó Ákos <glanthor@gmail.com>


Icons:
Tempest (Chad Jackson): http://tempest.deviantart.com/
License: CC Attribution-Noncommercial-No Derivative Works 3.0 Unported
http://creativecommons.org/licenses/by-nc-nd/3.0/
IM icons from Pidgin distribution (GPL)

Gartoon: Zeus <zeussama@gmail.com>
License: GPL


Sounds:
Borealis sound theme
by Ivica Ico Bukvic (SlipStreamScapes)
http://kde-look.org/content/show.php?content=12584
License: Creative Commons by-sa
http://creativecommons.org/licenses/by-sa/3.0/