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

cdnjs is a free distributed JS library delivery service.

SockJS is a browser JavaScript library that provides a WebSocket-like object.

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.

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

Swiper is a JavaScript library that creates modern touch sliders with hardware-accelerated transitions.