Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Getsitecontrol is a form and popup builder.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
PHP is a general-purpose scripting language used for web development.
Sentry is an open-source platform for workflow productivity, aggregating errors from across the stack in real time.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.