Apache is a free and open-source cross-platform web server software.
DigitalOcean Spaces is a cloud-based object storage service provided by DigitalOcean, a cloud infrastructure provider. It allows users to store and retrieve large amounts of data, such as images, videos, audio files, backups, and logs, using a simple RESTful API or a web-based graphical user interface (GUI).
Google Maps is a web mapping service. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets, real-time traffic conditions, and route planning for traveling by foot, car, bicycle and air, or public transportation.
Modernizr is a JavaScript library that detects the features available in a user's browser.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.
VK is a Russian online social media and social networking service.