Plone is a free and open source content management system built on top of the Zope application server. It is written in Python language but also contains large amounts of HTML, JavaScript, and CSS. You can build any kind of website, blog, and webshop using plone. Plone supports multiple operating systems like, Linux, Mac OS X, Windows, BSD, and Solaris. It is simple, easy to use, easy to set up, maintain and modify. Plone provides lots of features including, Multi-site Management, Flexible Workflows, Enterprise Integration, Industrial Strength Security, Search Capabilities, Multi-language support and much more.