Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
Gravitec is a push notification tool.
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.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.