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

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.

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.

cdnjs is a free distributed JS library delivery service.

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

ShareThis provides free engagement and growth tools (e.g., share buttons, follow buttons, and reaction buttons) for site owners.

Vue.js is an open-source model–view–viewmodel JavaScript framework for building user interfaces and single-page applications.

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.

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.

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