HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
JivoChat is a live chat solution for websites offering customizable web and mobile chat widgets.
Next.js is a React framework for developing single page Javascript applications.
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.
VK is a Russian online social media and social networking service.