Help out your favorite open source projects and become a better developer while doing it.

Catch common Java mistakes as compile-time errors

The Java gRPC implementation. HTTP/2 based RPC

Microsoft Azure SDK for Java

Graphical Java application for managing BibTeX and BibLaTeX (.bib) databases

High quality UI controls to complement the core JavaFX distribution

The Janssen Project is a home for open source IAM components, featuring Auth Server (OAuth/OpenID), Agama low-code identity orchestration, and the Cedarling policy decision point. The "Janssen Server" distributions bundle IAM components under one control

A private messenger for Android.

Postgresql JDBC Driver

Most popular Mocking framework for unit tests written in Java

SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.

An unofficial open source Reddit client for Android.

Spring Boot

Spring Framework

PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.

Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects. JSON, Jackson, Gson, JAX-RS integrations included

eXist Native XML Database and Application Platform

Open Source Identity and Access Management For Modern Applications and Services

H2 is an embeddable RDBMS written in Java.

:satellite: :cloud: :notes:Airsonic, a Free and Open Source community driven media server (fork of Subsonic and Libresonic)

A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.

Unleash the power of Java - JBang Lets Students, Educators and Professional Developers create, edit and run self-contained source-only Java programs with unprecedented ease.

Spring Batch is a framework for writing batch applications using Java and Spring

Autopsy® is a digital forensics platform and graphical interface to The Sleuth Kit® and other digital forensics tools. It can be used by law enforcement, military, and corporate examiners to investigate what happened on a computer. You can even use it to

Realm is a mobile database: a replacement for SQLite & ORMs

Traccar GPS Tracking System

Spoon is a metaprogramming library to analyze and transform Java source code. :spoon: is made with :heart:, :beers: and :sparkles:. It parses source files to build a well-designed AST with powerful analysis and transformation API.

A fast dependency injector for Android and Java.

AnkiDroid: Anki on Android

Apache Flink

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 8 and above, brought to you by Google.

A podcast manager for Android

Open-Source Web UI for Apache Kafka Management

ODK Collect is an Android app for filling out forms. It's been used to collect billions of data points in challenging environments around the world. Contribute and make the world a better place! ✨📋✨

ODK Collect is an Android app for filling out forms. It's been used to collect billions of data points in challenging environments around the world. Contribute and make the world a better place! ✨📋✨

A Java serialization/deserialization library to convert Java Objects into JSON and back

A java client library to access Exchange web services. The API works against Office 365 Exchange Online as well as on premises Exchange.

FastHub the ultimate GitHub client for Android.

Desktop/Android/HTML5/iOS Java game development framework

cBioPortal for Cancer Genomics

An application observability facade for the most popular observability tools. Think SLF4J, but for observability.

"Maven-node-grunt-gulp-npm-node-plugin to end all maven-node-grunt-gulp-npm-plugins." A Maven plugin that downloads/installs Node and NPM locally, runs NPM install, Grunt, Gulp and/or Karma.

Insanely easy way to work with Android Database.

OpenMRS API and web application code

Easily make RESTful web services for time series reporting with Big Data analytics engines like Druid and SQL Databases.

Spring HATEOAS - Library to support implementing representations for hyper-text driven REST web services.

Cross-platform framework for building truly native mobile apps with Java or Kotlin. Write Once Run Anywhere support for iOS, Android, Desktop & Web.

OpenRocket simulation software

Multi-platform transparent client-side encryption of your files in the cloud

Dubbox now means Dubbo eXtensions, and it adds features like RESTful remoting, Kyro/FST serialization, etc to the Dubbo service framework.

Lizzie - Leela Zero Interface