JUnit - JUnit is a simple framework to write repeatable tests.
jHipster - JHipster is a development platform to quickly generate, develop, & deploy modern web applications & microservice architectures.
Grails - An Open Source, full stack, web application framework for the JVM
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
Mustache.js - Minimal templating with {{mustaches}} in JavaScript - janl/mustache.js
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues