Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Criteo provides personalised retargeting that works with Internet retailers to serve personalised online display advertisements to consumers who have previously visited the advertiser's website.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.