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Plone “is ideal as an intranet and extranet server, as a document publishing system, a portal server and as a groupware tool for collaboration.

Installation: click-and-run installer (note: not a web based installation though, since it requires shell access on the server), have a content management system running on your computer in just a few minutes.

Internationalization: more than 50 language translations, and tools for managing multilingual content.

Accessibility: compliant with US Section 508, and the W3C’s AA rating for accessibility.

Technology: can interoperate with most relational database systems, open source and commercial, and runs on Linux, Windows, Mac OS X, Solaris and BSD.”

Plone is built using Zope, an object oriented application server, and the language that drives both Zope and Plone is Python. Plone is released under the GNU GPL open source license.