Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.

Varnish is a reverse caching proxy.

Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.

OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.

cdnjs is a free distributed JS library delivery service.

Google Analytics is a free web analytics service that tracks and reports website traffic.

JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.

Lightbox is small javascript library used to overlay images on top of the current page.

jQuery CDN is a way to include jQuery in your website without actually downloading and keeping it your website's folder.

Font Awesome is a font and icon toolkit based on CSS and Less.

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.

jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.

Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.

PHP is a general-purpose scripting language used for web development.