Include open-source and paid with respective official sites. Version is not up to date. Anyway here it goes.

Blogs:
b2evolution (1.9.2)(website)
Nucleus (3.24)(website)
pMachine Free (2.3)(website)
WordPress (2.1.2)(website)
Portals/CMS:
PHPTON (0.1.1)(Website)
Drupal (5.1)(website)
Geeklog (1.4.1)(website)
Joomla! (1.0.12)(website)
Mambo Open Source (4.6.1)(website)
PHP-Nuke (7.9)(website)
phpWCMS (1.1-RC4 Rev. A)(website)
phpWebSite (0.10.2)(website)
Post-Nuke (0.764)(visit site)
Siteframe (3.2.2)(website)
Typo3 (4.0.4)(website)
Xoops (2.0.16)(website)
Customer Support:
Crafty Syntax Live Help (2.13.1)(website)
Help Center Live (2.1.2)(website)
osTicket (1.3.1)(website)
PerlDesk (3.09) (Commercial, needs license)(website)
PHP Support Tickets (1.9)(website)
Support Logic Helpdesk (1.2)(website)
Support Services Manager (1.0b)(website)
Discussion Boards:
phpBB2 (2.0.22)(website)
SMF (1.1.2)(website)
IPB(website)
vBulletin(website)
myBB(1.2.7)(website)
E-Commerce:
CubeCart (3.0.15)(website)
OS Commerce (2.2 MS2 (060817))(website)
Zen Cart (1.3.7)(website)
FAQ:
FAQMasterFlex (1.51)(website)
Guestbooks:
ViPER Guestbook (X1.1)(website)
Hosting Billing:
AccountLab Plus (2.8) (Commercial, needs license)(website)
phpCOIN (1.2.4)(website)
Image Galleries:
4images Gallery (1.7.4)(website)
Coppermine Photo Gallery (1.4.10)(website)
Gallery (2.1.2)(website)
Image Tools
Image Upload Center(website)
Mailing List:
PHPlist (2.10.4)(website)
Polls and Surveys:
Advanced Poll (2.03)(website)
phpESP (1.8.2)(website)
PHPSurveyor (1.0)(website)
Project Management:
PHProjekt (5.2)(website)
dotProject (2.0.4)(website)
Site Builders:
Soholaunch Pro Edition (4.9 r55) (Commercial, needs license)(website)
Templates Express(website)
Wiki:
PhpWiki (1.2.10)(website)
TikiWiki (1.9.7)(website)
MediaWiki (1.10.0)(website)

Other Scripts:
Dew-NewPHPLinks (2.0.1.0b SEF w/Thumbshots)(website)
Moodle (1.7.1)(website)
Noah's Classifieds (1.3)(website)
Open-Realty (2.3.6)(website)
phpAdsNew (2.0.9-pr1)(website)
PHPauction (2.1)(website)
phpFormGenerator (2.09c)(website)
WebCalendar (1.0.5)(website)
Database Managements:
Sypex Dumper Lite (1.0.8)(website)