Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
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.
Slider Revolution is a flexible and highly customisable slider.
WP Rocket is a caching and performance optimisation plugin to improve the loading speed of WordPress websites.
WPML plugin makes it possible to build and run fully multilingual WordPress sites.
Yoast SEO Premium is a search engine optimisation plugin for WordPress and other platforms.