Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
PrestaShop is a freemium, open-source ecommerce solution, written in the PHP programming language with support for the MySQL database management system.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.