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

WP Engine is a website hosting provider.

WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.

Underscore.js is a JavaScript library which provides utility functions for common programming tasks. It is comparable to features provided by Prototype.js and the Ruby language, but opts for a functional programming design instead of extending object prototypes.

WooCommerce is an open-source ecommerce plugin for WordPress.

MySQL is an open-source relational database management system.

Ninja Forms is the WordPress form builder.

Query Migrate is a javascript library that allows you to preserve the compatibility of your jQuery code developed for versions of jQuery older than 1.9.

BackboneJS is a JavaScript library that allows to develop and structure the client side applications that run in a web browser.

PHP is a general-purpose scripting language used for web development.

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.