Java open-source

Open-source Java projects categorized as open-source | Edit details

Top 23 Java open-source Projects

  • cas

    Apereo CAS - Identity & Single Sign On for all earthlings and beyond.

    Project mention: Ask HN: What are the major open source alternatives to Auth0? | | 2021-11-30
  • airbyte

    Airbyte is an open-source EL(T) platform that helps you replicate your data in your warehouses, lakes and databases.

    Project mention: Which ETL tools are on demand ? | | 2022-05-19

    Airbyte is an open-source ELT (not ETL) tool with 6k stars on Github:

  • SonarLint

    Deliver Cleaner and Safer Code - Right in Your IDE of Choice!. SonarLint is a free and open source IDE extension that identifies and catches bugs and vulnerabilities as you code, directly in the IDE. Install from your favorite IDE marketplace today.

  • android

    📱 Nextcloud Android app (by nextcloud)

    Project mention: Nextcloud App alternative | | 2022-05-23

    Nope this is a currently open issue

  • android-demos

    Examples of Android applications

  • audiveris

    Latest generation of Audiveris OMR engine

    Project mention: Optical music recognition | | 2022-03-16

    From what I understand, OMR is a very hard problem. The only open-source library I know of is Audveris. Good luck!

  • countly-sdk-android

    Countly Product Analytics Android SDK

  • DSpace

    (Official) The DSpace digital asset management system that powers your Institutional Repository

  • Scout APM

    Less time debugging, more time building. Scout APM allows you to find and fix performance issues with no hassle. Now with error monitoring and external services monitoring, Scout is a developer's best friend when it comes to application development.

  • Slimefun4

    Slimefun 4 - A unique Spigot/Paper plugin that looks and feels like a modpack. We've been giving you backpacks, jetpacks, reactors and much more since 2013.

    Project mention: Looking for a plugin which breaks player placed blocks | | 2022-03-16

    I'd need more expansion on the idea: but maybe this can help.

  • News-Android-App

    📱:newspaper: Android client for the Nextcloud news/feed reader app

    Project mention: 20+ Trending and Popular Java Open Source Project | | 2022-05-10

    News Android

  • X-Road

    Source code of the X-Road® data exchange layer software

    Project mention: Gattyán György cyberpunk-Magyarországot vizionált egy egyetemi előadáson | | 2021-12-16
  • SAP Machine

    An OpenJDK release maintained and supported by SAP (by SAP)

  • castled

    Castled is an open source reverse ETL solution that helps you to periodically sync the data in your db/warehouse into sales, marketing, support or custom apps without any help from engineering teams

    Project mention: Data pipeline suggestions | | 2022-02-04

    Reverse ETL: Grouparoo, Castled

  • ContentBlocker

    Content blocking extension for Samsung Internet and Yandex Browser

    Project mention: Samsung Internet Beta v17 picks up AI-powered privacy enhancements | | 2022-03-17

    Interesting. It still might be worth submitting a Github issue request on AdGuard's content blocker page ( to see if there is some sort of filter they can implement to block these triggers. Otherwise, you are probably correct that it is a bug on Samsung's end and who knows when (if ever) that will be addressed.

  • ksql-udf-deep-learning-mqtt-iot

    Deep Learning UDF for KSQL for Streaming Anomaly Detection of MQTT IoT Sensor Data

  • BaldPhone

    A new accessible interface for your smartphone, suitable for seniors

    Project mention: suggest an open source, lightweight launcher? | | 2022-03-08

    For elderly, Baldphone

  • lexica

    Word Game for Android - A fork of lexic (

    Project mention: ⟳ 7 apps added, 50 updated at | | 2021-10-11

    Lexica (version 3.1.0): Find as many words as possible on a grid of random letters within a time limit

  • postman

    1.12.2 anarchy client :) (by srgantmoomoo)

    Project mention: What is the best open source hacked client for cpvping not wurst+3 or phobos | | 2021-10-20


  • behe-keyboard

    A lightweight hacking & programming keyboard with material design

    Project mention: a keyboard app with Ctrl, Alt and Shift keys | | 2021-07-08

    Little activity past the initial commits:

  • RatingReviews

    Simple rating bars, a view similar to the ones seen on Google Playstore. ⭐🌟✨

  • cloud-opensource-java

    Tools for detecting and avoiding linkage errors in GCP open source projects

  • sonarqube-licensecheck

    SonarQube Licensecheck Plugin

  • osrmt

    Open Source Requirements Management Tool

  • Kouncil

    Simple dashboard for your Kafka. Monitor status, manage groups, topics, send messages and diagnose problems. All in one user friendly web dashboard.

    Project mention: Kafka UI supports kraft mode | | 2021-09-26

    You can use Kouncil -

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-05-23.

Java open-source related posts


What are some of the best open-source open-source projects in Java? This list will help you:

Project Stars
1 cas 9,439
2 airbyte 6,800
3 android 2,886
4 android-demos 1,970
5 audiveris 861
6 countly-sdk-android 645
7 DSpace 639
8 Slimefun4 608
9 News-Android-App 564
10 X-Road 431
11 SAP Machine 366
12 castled 316
13 ContentBlocker 276
14 ksql-udf-deep-learning-mqtt-iot 255
15 BaldPhone 224
16 lexica 201
17 postman 147
18 behe-keyboard 146
19 RatingReviews 143
20 cloud-opensource-java 122
21 sonarqube-licensecheck 105
22 osrmt 104
23 Kouncil 101
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