Plone is a user-friendly powerful content management system - ideal as an intranet and extranet server, as a document publishing system, a portal server and as a groupware tool for collaboration between separately located entities

Here are some key features of "Plone":

· Plone is powerful and flexible. It is ideal as an intranet and extranet server, as a document publishing system, a portal server and as a groupware tool for collaboration between separately located entities.
· Plone is easy to use. The Plone Team includes usability experts who have made Plone easy and attractive for content managers to add, update, and maintain content.
· Plone is easy to install. You can install Plone with a click-and-run installer, and have a content management system running on your computer in just a few minutes.
· Plone is international. The Plone interface has been translated into over 40 languages, and tools exist for managing multilingual content.
· Plone is standard. Plone carefully follows standards for usability and accessibility. Plone pages are compliant with US Section 508, and the W3C's AA rating for accessibility, in addition to using best-practice web standards like XHTML and CSS.
· Plone is Open Source. Plone is licensed under the GNU General Public License, the same license Linux uses. This gives you the right to use Plone without a license fee, and to improve upon the product.
· Plone is supported. There are close to a hundred developers in the Plone Development Team around the world, and a multitude of companies specializing in Plone development and support.
· Plone is extensible. There are many add-on products for Plone that add new features and content types. In addition, Plone can be scripted using web standard solutions and Open Source languages.