Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Magento is an open-source ecommerce platform written in PHP.
Mailchimp is a marketing automation platform and email marketing service.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Prototype is a JavaScript Framework that aims to ease development of web applications.