Disqus is a worldwide blog comment hosting service for web sites and online communities that use a networked platform.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
VK is a Russian online social media and social networking service.
Yandex.Metrica is a free web analytics service that tracks and reports website traffic.