Batflat - Lightweight, fast, easy, and free CMS.
nCMS - Open source enterprise Java CMS engine
Shopping feed - Shopping feed is a versatile eCommerce application that allows eCommerce stores to thousands of channels.
Drupal - Drupal - the leading open-source CMS for ambitious digital experiences that reach your audience across multiple channels. Because we all have different needs, Drupal allows you to create a unique space in a world of cookie-cutter solutions.
ImpressPages CMS - ImpressPages is a PHP framework with admin panel.
Joomla - Joomla! is the mobile-ready and user-friendly way to build your website. Choose from thousands of features and designs. Joomla! is free and open source.