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.
cdnjs is a free distributed JS library delivery service.
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.
Modernizr is a JavaScript library that detects the features available in a user's browser.
A simple, high-performance and cross-browser jQuery rotating / carousel plugin for text phrases powered by Animate.css.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Paddle is a billing and payment gateway for B2B SaaS companies.
PHP is a general-purpose scripting language used for web development.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.