vBulletin
From TWC Wiki
vBulletin is one of the leading commercial forum software packages, which TWC currently uses. It used to use Invision Power Boards, but that turned out to be insecure, as was evidenced by the hacker attacks leading to the May 2005 crisis. During those attacks, Ogre's Net asked for help and were told to not use IPB, but to switch to vB instead. When that was done, the attacks stopped.
