Java open-source

Open-source Java projects categorized as open-source

Top 23 Java open-source Projects

  • cas

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

    Project mention: [Self Hosted] Expériences avec des alternatives KeyCloak | | 2023-04-21
  • android

    📱 Nextcloud Android app (by nextcloud)

    Project mention: Autoupload feature is still buggy. Looking for alternatives... | | 2023-05-22

    However, there are some longer standing issues with uploads that seems to only impact a small subset of people. It's generally blamed on different versions of android handling background processes and permissions differently. There doesn't seem to be one single cause, or one solution, other than what's suggested in that issue.

  • Sonar

    Write Clean Java Code. Always.. Sonar helps you commit clean code every time. With over 600 unique rules to find Java bugs, code smells & vulnerabilities, Sonar finds the issues while you focus on the work.

  • Omni-Notes

    Open source note-taking application for Android

    Project mention: Doesn't work with Android 13 | | 2023-02-05
  • OpenBoard

    100% foss keyboard based on AOSP, with no dependency on Google binaries, that respects your privacy.

    Project mention: Keyboard for android? | | 2023-05-01
  • android-demos

    Examples of Android applications

  • Shelter

    A Free and Open-Source (FOSS) app that leverages the "Work Profile" feature of Android to provide an isolated space that you can install or clone apps into.

    Project mention: Dual Sim | | 2023-05-28
  • audiveris

    Latest generation of Audiveris OMR engine

    Project mention: Music scanning software | | 2023-04-30

    I am surprised that noone mentioned Audiveris, which is free and opensource music "OCR" software.

  • InfluxDB

    Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.

  • FOSS Browser

    "FOSS Browser" is a fully free (as in freedom) open source Android browser: privacy-friendly with a modern user interface. (by scoute-dich)

    Project mention: Fast & light browsers for 2GB ram phones. | | 2022-08-15
  • 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: vanilla 1.19.4 plugins | | 2023-05-13

    Slimefun, and maybe some addons for it

  • DSpace

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

  • linstor-server

    High Performance Software-Defined Block Storage for container, cloud and virtualisation. Fully integrated with Docker, Kubernetes, Openstack, Proxmox etc.

    Project mention: Longhorn alternatives | | 2023-01-13

    Tbf that isn't distributed storage. You could use DBRD with ZFS over it though, to accomplish this. I plan to try it at some point - I love ZFS, and for my NAS and backup target it's terrific, but I want something that can distribute across my three compute nodes.

  • countly-sdk-android

    Countly Product Analytics Android SDK

  • News-Android-App

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

    Project mention: Github vs fdroid | | 2022-08-26
  • X-Road

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

    Project mention: Source code of the X-Road data exchange layer software | | 2023-05-30
  • personalDNSfilter

    personalDNSfilter is a DNS filter proxy written in Java.

    Project mention: best adblock for crunchyroll on android? | | 2023-01-03

    Maybe try btw: its on FDroid Store too

  • knime-core

    KNIME Analytics Platform

    Project mention: Has anybody used Orange? | | 2023-04-04
  • SAP Machine

    An OpenJDK release maintained and supported by SAP

    Project mention: What's the business thinking behind so many different OpenJDK builds by different vendors? | | 2023-05-01

    SapMachine has specific changes that is used in their Cloud platforms.

  • ContentBlocker

    Content blocking extension for Samsung Internet and Yandex Browser

  • UrlChecker

    Android app by TrianguloY: URLCheck

    Project mention: Brave – copy clean link feature | | 2023-03-09

    For Android, I've been using URLCheck[0] for opening any link system wide, to clean the URL and check for redirects and open in specific browser. Just have to set it as your default browser


  • 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: Looking for a similar launcher like BaldPhone | | 2022-08-08

    I'm looking for a more updated launcher like BaldPhone that aims to help elderly people to use smartphone with an easier to use interface. It would be better if the launcher also has easier interface for messaging app which BaldPhone doesn't have.

  • lexica

    Word Game for Android - A fork of lexic (

  • Kouncil

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


    ONLYOFFICE Docs — document collaboration in your environment. Powerful document editing and collaboration in your app or environment. Ultimate security, API and 30+ ready connectors, SaaS or on-premises

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 2023-05-30.

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 10,147
2 android 3,433
3 Omni-Notes 2,552
4 OpenBoard 2,113
5 android-demos 1,984
6 Shelter 1,644
7 audiveris 1,092
8 FOSS Browser 1,028
9 Slimefun4 761
10 DSpace 743
11 linstor-server 696
12 countly-sdk-android 655
13 News-Android-App 617
14 X-Road 520
15 personalDNSfilter 495
16 knime-core 449
17 SAP Machine 427
18 ContentBlocker 363
19 UrlChecker 311
20 ksql-udf-deep-learning-mqtt-iot 268
21 BaldPhone 252
22 lexica 239
23 Kouncil 191
ONLYOFFICE Docs — document collaboration in your environment
Powerful document editing and collaboration in your app or environment. Ultimate security, API and 30+ ready connectors, SaaS or on-premises