Elementor - Elementor is a front-end drag & drop page builder for WordPress.
Divi Theme - A flexible WordPress theme with the power of Divi Builder built in.
Layers - A simple Wordpress site builder & its free forever
SiteOrigin Page Builder - Build responsive grid-based page content that adapts on WordPress
Colibri WP - WordPress site builder that gives you design superpowers
Visual Composer - Visual Composer is an advanced website builder for WordPress.