Joomla is a content management system (CMS) written in PHP and JavaScript, using MySQL and MsSQL databases as storage. It is free software distributed under the GNU/GPL license.
What is MODX?
MODX offers you a system that allows you to publish your offline content to the web in any form, shape, or presence you desire.
OpenCart – platform overview
Its capabilities are enough to develop almost any e-commerce site: from small e-commerce sites to storefronts with thousands of items and hundreds of product categories.