Free universal database tool and SQL client

JDK main-line development https://openjdk.org/projects/jdk

Quarkus: Supersonic Subatomic Java.

A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)

The ZAP by Checkmarx Core project

Idiomatic persistence for Java and relational databases

H2 is an embeddable RDBMS written in Java.

Java libraries for writing microservices

A Java architecture test library, to specify and assert architecture rules in plain Java

WildFly Application Server

Apache NetBeans

Java EE 7 Samples

This is the public repository for the CFR Java decompiler

Modern Java decompiler aiming to be as accurate as possible, with an emphasis on output quality. Fork of the Fernflower decompiler.

https://openjdk.org/projects/loom

YAS: Yet Another Shop, a sample microservices project in Java

Embulk: Pluggable Bulk Data Loader.

The open source Solver AI for Java and Kotlin to optimize scheduling and routing. Solve the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning p…

Concurrency Patterns and features found in Java, through multithreaded programming. Threads, Locks, Atomics and more.

Tool for parsing GC logs

https://openjdk.org/projects/jmc OpenJDK Mission Control, a production time profiling and diagnostics tools suite.

Payara Server is an open source middleware platform that supports reliable and secure deployments of Java EE (Jakarta EE) and MicroProfile applications in any environment: on premise, in the cloud …

Building modular, monolithic applications using Spring Boot

The Open Source Java EE Reference Implementation

Eclipse Jersey Project - Read our Wiki:

https://openjdk.org/projects/nashorn

Create native Java(FX) apps for desktop, mobile and embedded

A scalable, event-driven and event-sourced Java EE application

Java EE 8 Samples

A Runner and API for Layered Java Applications