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90 stars written in Java
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Design patterns implemented in Java

Java 93,882 27,360 Updated Mar 20, 2026

Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.

Java 80,416 41,896 Updated Apr 16, 2026

Spring Framework

Java 59,852 38,859 Updated Apr 16, 2026

Free universal database tool and SQL client

Java 49,619 4,116 Updated Apr 17, 2026

Dex to Java decompiler

Java 48,108 5,492 Updated Apr 14, 2026

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Java 26,116 7,491 Updated Apr 17, 2026

FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

Java 23,609 803 Updated Jul 15, 2024

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

Java 22,781 6,306 Updated Apr 17, 2026

Most popular Mocking framework for unit tests written in Java

Java 15,428 2,652 Updated Apr 16, 2026

Free implementation of Play Services

Java 12,952 2,712 Updated Apr 10, 2026

Generate diagrams from textual description

Java 12,914 1,174 Updated Apr 16, 2026

A free, secure and open source app for Android to manage your 2-step verification tokens.

Java 12,300 521 Updated Feb 24, 2026

PocketHub Android App

Java 9,374 3,421 Updated Jun 6, 2023

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Java 8,630 1,825 Updated Apr 16, 2026

An annotation processor for generating type-safe bean mappers

Java 7,644 1,015 Updated Apr 12, 2026

Catch common Java mistakes as compile-time errors

Java 7,158 788 Updated Apr 16, 2026

Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.

Java 6,183 5,094 Updated Apr 16, 2026

Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …

Java 5,354 457 Updated Oct 30, 2025

AIMSICD • Fight IMSI-Catcher, StingRay and silent SMS!

Java 5,239 1,025 Updated Feb 27, 2026

Customizable and privacy-conscious open-source keyboard

Java 5,043 274 Updated Apr 16, 2026

Apache Maven core

Java 5,024 2,862 Updated Apr 17, 2026

Brings the popular ruby faker gem to Java

Java 4,916 864 Updated Jun 12, 2024

Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.

Java 4,311 520 Updated Mar 30, 2026

[Unmaintained] Open source two-factor authentication for Android

Java 3,726 376 Updated Jun 14, 2022

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

Java 3,662 334 Updated Apr 16, 2026

Apache Maven Daemon

Java 3,419 242 Updated Apr 15, 2026

The reliable, generic, fast and flexible logging framework for Java.

Java 3,215 1,356 Updated Apr 10, 2026

Fluent testing assertions for Java and the JVM

Java 2,820 770 Updated Apr 16, 2026

An in-memory file system for Java

Java 2,540 282 Updated Apr 15, 2026

OpenKeychain is an OpenPGP implementation for Android.

Java 2,535 521 Updated May 16, 2024
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