Chart.js is an open-source JavaScript library that allows you to draw different types of charts by using the HTML5 canvas element.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
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.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.
Swiper is a JavaScript library that creates modern touch sliders with hardware-accelerated transitions.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.
VK is a Russian online social media and social networking service.