Fantastico

Fantastico De Luxe is an amazing CPanel/PHP based Web application. It integrates with CPanel and gives you and your clients the ability to install following Open Source Applications with one click:

4Images Gallery
AccountLab Plus
Advanced Poll
b2evolution
Coppermine Photo Gallery
CubeCart
Dew-NewPHPLinks
dotProject
Drupal
FAQMasterFlex
Gallery
Geeklog
Joomla
Mambo Open Source
Moodle
Noahs Classifieds
Nucleus
Open-Realty
osTicket
OS Commerce
PerlDesk
PHP-Nuke
phpAdsNew
PHPauction
phpBB2
phpCOIN
phpESP
phpFormGenerator
PHPlist
PHProjekt
PHPSurveyor
phpWCMS
phpWebSite
PhpWiki
PHP Support Tickets
pMachine Free
Post-Nuke
Siteframe
SMF
Support Logic Helpdesk
Templates Express
TikiWiki
TYPO3
ViPER Guestbook
WebCalendar
WordPress
Xoops
Zen Cart

No setup/monthly fees for Fantastico. It's free as long as you have an active account with WestNIC.net