Ruby on Rails
high speed of web-application development on the multi-level framework, with MVC architecture
Ruby
object-Oriented Programming with pleasure on expressive and brief language
MongoDB
super-fast document-oriented database, horizontal scalability out of the frame, without the data schema
PostgreSQL
most advanced relational open source database, reliability and stability at high loads
Elasticsearch
distributed search and analytics engine
React
building user interfaces
Redis
in-memory data structure store, used as a database, cache and message broker
Slim template
reduction in html-code using a fast template engine for Ruby
Compass Framework
simplification of life with cross-browser css, set of ready-made functions and impurities for scss
RVM
switching between Ruby, Ruby on Rails versions and projects with different sets of gems
Nginx HTTP server
creation of loaded systems with using fast and reliable server for static
Unicorn
usage of all advantages of Unix-like operating systems, load balancing at the core level
Capistrano
deployment of web-applications and automation of tasks on one or more remote servers
Chef
cross-platform toolkit for automated server configuration management