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.

Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface.

Amazon Web Services (AWS) is a comprehensive cloud services platform offering compute power, database storage, content delivery and other functionality.

Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds.

PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.

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.

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

BootstrapCDN is a powerful and reliable Content Delivery Network (CDN) that delivers static resources, including CSS, JavaScript, and font files, for the widely-used Bootstrap framework. By leveraging multiple server locations worldwide, BootstrapCDN accelerates website loading times, ensuring a smooth and visually appealing user experience. Additionally, it ensures website compatibility with various devices and browsers. The service reduces bandwidth usage and server load, improving web performance for developers and end-users alike.

YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.

OWL Carousel is an enabled jQuery plugin that lets you create responsive carousel sliders.

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

Tengine is a web server which is based on the Nginx HTTP server.

Vercel is a cloud platform for static frontends and serverless functions.

Cloudflare Browser Insights is a tool that measures the performance of websites from the perspective of users.