Useful CMS and Free script collection

CMS:
Drupal
JOOMLA

Ecommerce Solution
ZenCart
osCommerce

Blog
Wordpress
GroupWare
WebCollab

Forum
SMF
PUNBB
PHPBB
MYBB

E-Learning
Moodle
ATutor
SiteAtSchool

Image Galleries
Gallery 2
Gallery
Coppermine
4Images

Wiki
DocuWiki
Pmwiki
MediaWiki