Zope - Plone 3 Services: Leveraging Open Source
Zope and Plone application development and hosting. Plone is a ready-to-run content management system that is built on the powerful and free Zope application server. Easy to set up, extremely flexible, and provides you with a system for managing web content that is ideal for project groups, communities, web sites, extranets and intranets.
Plone takes an open-source approach to best-of-breed design and provides companies with an excellent environment for building dynamic and collaborative portals, intranets and web sites. 
Plone's core features include an enterprise-level content management system, a solid workflow engine, a wiki, role-based membership, and a search engine.

