Groovy

Groovy is a feature-rich, agile and dynamic language for the Java Virtual Machine.

Grails

Grails is an Open Source, full stack, web application framework for the JVM.

Spring Boot

It is a Spring module which provides Rapid Application Development feature to Spring frame.

Ratpack

Ratpack is a set of Java libraries that facilitate fast, efficient, revolvable and well-tested HTTP applications.

Vertx

Vert.x is a tool-kit for building reactive applications on the JVM.