Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Headroom.js is a JS widget that allows you to react to the user's scroll. The header slides out of view when scrolling down and slides back in when scrolling up.
Highcharts is a charting library written in pure JavaScript, for adding interactive charts to a website or web application. Highcharts meets accessibility standards and works with Python, Angular, React, iOS, Android, and more.
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.