Feature-rich testing framework for Crystal inspired by RSpec.

Simple framework which allows the testing of Swing and JavaFX2 applications.

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

JavaFX JRuby binding

RxJava bindings for JavaFX

A high performance implementation of the Ruby programming language, built on GraalVM.

The Crystal Programming Language

Routing Tree Web Toolkit

Sequel: The Database Toolkit for Ruby

JRuby, an implementation of Ruby on the JVM