Apache is a free and open-source cross-platform web server software.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Unix is a family of multitasking, multiuser computer operating systems.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.
WPBakery is a drag and drop visual page builder plugin for WordPress.