Joomla

Joomla! is a free and open-source content management system for publishing web content, developed by Open Source Matters, Inc. It is built on a model–view–controller web application framework that can be used independently of the CMS. Wikipedia
Developer(s)Open Source Matters, Inc. and the Joomla community
Stable release3.8.12 / 28 August 2018; 29 days ago
Preview release4.0.0-alpha4 / 23 July 2018; 2 months ago
Initial release dateSeptember 22, 2005