Ruby on Rails is the most prominent web app development tool. It’s an open-source server-side web application framework. It allows the developer to build a website and application with ease. Ruby on Rails automatically separates the repetitive tasks and allow developers to do better customization. Rails is written in Ruby, the programming language. It’s an object-oriented programming language. It consists of everything one needs to build an incredible application. Ruby on Rails is an open source software so not only free to use but also easy to learn. Here we have listed some of the best applications build on Ruby on Rails: Basecamp, GitHub, SoundCloud, Zendesk and a lot more.