Plone is a ready-to-run content management system that is built on the powerful and free Zope application server. Plone is easy to set up and extremely flexible and provides users with a system for managing Web content that is ideal for project groups, communities, websites, extranets and intranets. The OSL provides hosting for a plone development box that hosts their version control system, svn.plone.org, as well as http://planet.plone.org, which aggregates developer blog entries.