Django is a Python-based free and open-source web application framework.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Unpkg is a content delivery network for everything on npm.
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.