Bugsnag is a cross-platform error monitoring, reporting, and resolution software.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Intercom is an American software company that produces a messaging platform which allows businesses to communicate with prospective and existing customers within their app, on their website, through social media, or via email.
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.