From Plone Foundation:
Plone is a content management system with strong multilingual support. 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. 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. Its interface has more than 50 language translations, and tools for managing multilingual content.
Plone carefully follows standards for usability and accessibility. Its 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.
What's new in this version: Version 4.3 fixes various vulnerabilities in Zope and Plone including arbitrary code execution and privilege escalation.
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All versions:4.3 stars
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"I like it."
Version: Plone 2.1.2
This is a great collaboration program that allows multiple people to work on a single project across time zones.
Hard to use if people arent really computer literate.
"Simply Best CMS"
Version: Plone 2.1.2
If you are looking for a CMS that meets today's accessibility standards (Section 508 and W3C's WAI-AA) as well as valid XHTML and CSS this is the one you have been looking for. I have been using Plone on my production site for over two years, the site get about 25,000 visitors each week.