Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Gambio is an all-in-one shopping cart solution for small to medium sized businesses.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
PHP is a general-purpose scripting language used for web development.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.