Plone

Plone is a content management system (CMS) based on Zope.

As of August 2006, Plone is not allowed on DreamHost because it requires Zope, and Zope is not allowed because it consumes too many resources.

The DreamHost Forum thread Plone at DH? talks about Plone on DreamHost. Interesting comments:
 * "Plone isn't going to work on a DreamHost shared server, because the Zope server needs to be running all the time. Zope is pretty resource intensive, so I expect the Zope server will get killed." See KB " What is your persistent (background) process policy?"