Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Visual Composer is an all-in-one web design tool for anyone who uses WordPress.
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.
WP-Statistics is a WordPress plugin which allows you to know your website statistics.
Yoast SEO is a search engine optimisation plugin for WordPress and other platforms.