Plone is a free and open source content management system built on top of the Zope application server. Plone can be used for any kind of website, including blogs, internet sites, webshops and internal websites. It's also used as a document publishing system and collaboration tool. Plone features a flexible workflow, extensibility and good security.

Symfony is a web application framework written in PHP which follows the model-view-controller (MVC) paradigm. It provides an architecture, components and tools for developers to build complex web applications faster by minimizing repetitive coding tasks.

Drupal is an open source content management platform licensed under the GPL. Equipped with a powerful blend of features, Drupal can support a variety of websites ranging from personal blogs, corporate brochures and large community-driven websites. This appliance includes Drupal v9.x.