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.
Lightbox is small javascript library used to overlay images on top of the current page.
LiteSpeed Cache is an all-in-one site acceleration plugin for WordPress.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.