In a nutshell Jenkins CI is the leading open-source continuous integration server. Built with Java, it provides over 300 plugins to support building and testing virtually any project.

OrientDB is an Open Source NoSQL DBMS with both the features of Document and Graph DBMSs.

This is the project website for the TEAMMATES feedback management tool for education https://teammatesv4.appspot.com/

Open Source, Distributed, RESTful Search Engine

Ratpack is a high-throughput, non-blocking web framework for the JVM.

VR Framework on Android that supports both Oculus Mobile SDK and Google DayDream. (gearvrf.org)

Java library of object-oriented primitives

A "standard library" of community contributed procedures and functions for the open-source graph database Neo4j

The AWS SDK for Java enables Java developers to easily work with Amazon Web Services.

Fast Java routing engine for roads and more. GraphHopper is Open Source and uses OpenStreetMap.

The Apache JMeter™ application is open source software, a 100% pure Java application designed to load test functional behavior and measure performance.

Open source build-test-release cycle automation.

GoCD helps you automate and streamline the build-test-release cycle for worry-free, continuous delivery of your product.

Enterprise grade OpenID Connect and OAuth 2.0 server providing identity, federation, authentication, and authorization

Apache JAMES is a modern, composable mail server implementing the IMAP, SMTP and JMAP protocols.

The goal of Swagger™ is to define a standard, language-agnostic interface to REST APIs which allows both humans and computers to discover and understand the capabilities of the service without access

CrateDB is a distributed SQL database. Give us a shove if you ever need any help or have questions!

Strongbox is an alternative Java-based artifact repository manager.

WebGoat: A deliberately insecure Web Application

Open Source application generator for creating Spring Boot + AngularJS projects in seconds!