Plone is an Open Source Content Management System (CMS) based on the Python programming language. Plone has been maturing into one of the largest Open Souce projects worldwide since it's release in 2001.
Plone is a Python-based Open Source CMS that lets users create and maintain a public website or an application only using a web browser. Plone is backed by the Plone community that extends throughout many countries, and is translated into more than 40 languages. It has the best security track record compared to any other major CMS (source: http://cve.mitre.org/).
Hundreds of Plone add-ons are publicly available, free and Open Source, which add useful functionalities to your website.
Migrate your existing solution to the newest version of Plone to benefit from superior security, advanced access control, scalability, high speed, intuitive content editing, and more.
Upgrade your existing Plone site to the newest Plone 4 version and benefit from improved performance and content editing experience, access to latest add-ons and more.
Before selecting the optimal platform to meet your project requirements you can get first-hand experience with Plone, using one of the available DEMO sites.