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

Catch common Java mistakes as compile-time errors

Support for adding OAuth1(a) and OAuth2 features (consumer and provider) for Spring web applications.

The Java gRPC implementation. HTTP/2 based RPC

光 HikariCP・A solid, high-performance, JDBC connection pool at last.

A scalable, distributed Time Series Database.

Microsoft Azure SDK for Java

High quality UI controls to complement the core JavaFX distribution

Spring Boot

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

Postgresql JDBC Driver

A private messenger for Android.

Most popular Mocking framework for unit tests written in Java

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

Spring Framework

eXist Native XML Database and Application Platform

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

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

An unofficial open source Reddit client for Android.

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.

Apache Flink

Traccar GPS Tracking System

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

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

AnkiDroid: Anki on Android

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 podcast manager for Android

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

A fast dependency injector for Android and Java.

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

Open-Source Web UI for Apache Kafka Management

cBioPortal for Cancer Genomics

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

Desktop/Android/HTML5/iOS Java game development framework

FastHub the ultimate GitHub client for Android.

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.

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

OpenMRS API and web application code

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.

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

Insanely easy way to work with Android Database.

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

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

Elixir plugin for JetBrain's IntelliJ Platform (including Rubymine)