There's a lot to tell about Plone.
"Plone is a ready-to-run ["content management system"] that is built on the powerful and free ["Zope"] ["application server"]." So says the "[http://plone.org/about/plone/ What is Plone?]" page of the [http://plone.org Plone Web site].
[Explain what this means.]
A PloneSprint is frequently scheduled--half-a-dozen times annually? There are local user group meetings, annual conferences, ...
Plone is particularly prominent in Latin America, Europe, ...