vbDrupal is a fork of the popular CMS Drupal
tightly integrated with the forum software
vBulletin. It offers a single sign-on and shared
session management between Drupal and vBulletin.
It also adds the ability to share functionality.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
