Google Friend Connect plug-in for Drupal
http://code.google.com/p/drupal-friendconnect/
Corporation - Drupal Theme
http://osc3.template-help.com/drupal_19061/
BitNami Application Stacks - Servers, Drupal, Wiki, Trac, Mantis, Subversion, phpBB
http://bitnami.org/stacks
Drupal Ecommerce Module
http://drupalecommerce.org/
Drigg - Drupal Digg-style Module
http://www.drigg.org/
Drupal CMS
http://www.drupal.org