A key element of Spring is infrastructural support at the application level: Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments.
Active Admin is a Ruby on Rails framework for creating elegant backends for website administration.
It is an exciting new way to build modern, reactive, real-time apps with Ruby on Rails.
It eliminates the complexity imposed by full-stack frontend frameworks. And, it's fast.
It works seamlessly with the Rails tooling you already know and love.
It is a package manager for the Ruby programming language that provides a standard format for distributing Ruby programs and libraries, a tool designed to easily manage the installation of gems, and a server for distributing them.