The document summarizes information about Plone, an open source content management system (CMS). It notes that Plone has been available since 2001, is written in Python and runs on the Zope application server. It is among the top 2% of open source projects based on activity and has over 200 core developers worldwide. Plone's full version is free and its intellectual property is owned by the Plone Foundation. It is well suited for enterprise-level CMS needs and is used by organizations like the FBI, United Nations, and various companies.