Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can "just run". We take an opinionated view of the Spring platform and third-party libraries so you can get started with minimum fuss. Most Spring Boot applications need very little Spring configuration.
Rails is a web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.
It provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
The framework's core features can be used by any Java application, but there are extensions for building web applications on top of the Java EE platform.
Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
Android provides a rich application framework that allows you to build innovative apps and games for mobile devices in a Java language environment.