Plone is a powerful, flexible, open source Content Management System (CMS) built on top of Zope application server and CMF.

Features:

- Flexible and adaptable workflow

- Customisable

- Free add-ons

- Versioning, history and reverting content

- Support for multiple mark up formats

- Multilingual content management

- RSS feed support

- WebDAV and FTP support

- WYSIWYG

- Integrates with Active Directory, Salesforce, LDAP, SQL, Web Services, LDAP and Oracle