Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Elementor - Elementor is a front-end drag & drop page builder for WordPress.
Anchor CMS - Free and lightweight blogging system
Divi Theme - A flexible WordPress theme with the power of Divi Builder built in.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Visual Composer - Visual Composer is an advanced website builder for WordPress.