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.

Snowplow is an open-source behavioral data management platform for businesses.

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.

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

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

CDN77 is a content delivery network (CDN).

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

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.

Chart.js is an open-source JavaScript library that allows you to draw different types of charts by using the HTML5 canvas element.

SweetAlert2 is a JavaScript library that provides customisable, visually appealing, and responsive alert and modal dialog boxes for web applications.

Magnific Popup is a responsive lightbox & dialog script with focus on performance and providing best experience for user with any device.

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

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.

Prism is an extensible syntax highlighter.

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

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.