Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Frappe is a full stack, batteries-included, web framework written in Python and Javascript.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Google Optimize allows you to test variants of web pages and see how they perform.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.