BEM (Block, Element, Modifier) is a naming convention for classes in HTML and CSS what was developed by Yandex.
Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
VK is a Russian online social media and social networking service.