jean-voila / FeurStagram

A patch for the official Instagram Android app that removes the feed, Reels, Explore and ads while keeping DMs, stories and search.

Card-Forge / forge

An unofficial rules engine for the world's greatest card game.

emanuele-f / PCAPdroid

No-root network monitor, firewall and PCAP dumper for Android

aleixrodriala / newtube

SmartTube for phones, unofficial: an open-source YouTube client for Android. Background play, PiP, SponsorBlock, DeArrow, save for offline, code sign-in.

kekingcn / kkFileView

Universal File Online Preview Project based on Spring-Boot

flowable / flowable-engine

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

modelcontextprotocol / java-sdk

The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI

DrKLO / Telegram

Official source code for the Telegram messaging app for Android, written in Java.

apache / fesod

Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.

trinodb / trino

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

aeron-io / aeron

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

TGX-Android / Telegram-X

The main repository of Telegram X — official alternative Telegram client for Android.

tonikelope / megabasterd

Yet another unofficial (and ugly) cross-platform MEGA downloader/uploader/streaming suite.

AsamK / signal-cli

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

geoserver / geoserver

Official GeoServer repository

QuantumBadger / RedReader

An unofficial open source Android app for Reddit.

bit4woo / domain_hunter_pro

domain_hunter的高级版本，SRC挖洞、HW打点之必备！自动化资产收集；快速Title获取；外部工具联动；等等

m-farhan-hamim / NetShield-DNS-Resolver-by-PSBDx

A local DNS resolver, ad/tracker sinkhole and live traffic dashboard for Android. Private, open source, and built in pure Java. No Firebase, no Google Play Services, no tracking.

prestodb / presto

The official home of the Presto distributed SQL query engine for big data

mock-server / mockserver-monorepo

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.

aws / aws-sdk-java

The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/

kubernetes-client / java

Official Java client library for kubernetes

apache / logging-log4j2

Apache Log4j is a versatile, feature-rich, efficient logging API and backend for Java.

opensolon / solon

🔥 Java enterprise application development framework for full scenario: Restrained, Efficient, Open, Ecologicalll!!! 700% higher concurrency 50% memory savings Startup is 10 times faster. Packing 90% smaller; Compatible with java8 ~ java26; Supports LTS. (Replaceable spring)

mongodb / mongo-java-driver

The official MongoDB drivers for Java, Kotlin, and Scala

aws / aws-sdk-java-v2

The official AWS SDK for Java - Version 2

apache / logging-flume

Apache Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log-like data

apache / poi

Mirror of Apache POI gitbox. The Java API for Microsoft Documents.

mastodon / mastodon-android

Official Android app for Mastodon

broadinstitute / gatk

Official code repository for GATK versions 4 and up

geotools / geotools

Official GeoTools repository

Discord4J / Discord4J

Discord4J is a fast, powerful, unopinionated, reactive library to enable quick and easy development of Discord bots for Java, Kotlin, and other JVM languages using the official Discord Bot API.

OpenHFT / Java-Thread-Affinity

Bind a java thread to a given core

apache / guacamole-client

The Apache Guacamole web application, official extensions, and JavaScript library.

SpigotMC / BungeeCord

BungeeCord, the 6th in a generation of server portal suites. Efficiently proxies and maintains connections and transport between multiple Minecraft servers.

babyfish-ct / jimmer

The most advanced ORM of JVM, for both java & kotlin

jodconverter / jodconverter

JODConverter automates document conversions using LibreOffice or Apache OpenOffice.

jnr / jnr-ffi

Java Abstracted Foreign Function Layer

sirixdb / sirix

SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.

quickfix-j / quickfixj

QuickFIX/J is a full featured messaging engine for the FIX protocol. - This is the official project repository.

bardsoftware / ganttproject

Official GanttProject repository.

DSpace / DSpace

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

mixpanel / mixpanel-android

Official Android Tracking Library for Mixpanel Analytics

pixelsdb / pixels

An efficient storage and compute engine for both on-prem and cloud-native data analytics.

maxwai / NClientV3

An unofficial NHentai android client

mguessan / davmail

DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at

igvteam / igv

Integrative Genomics Viewer. Fast, efficient, scalable visualization tool for genomics data and annotations

greenmail-mail-test / greenmail

Official master for the Greenmail project

ionic-team / capacitor-plugins

Official plugins for Capacitor ⚡️

PowerNukkitX / PowerNukkitX

Open-source, feature-rich Minecraft: Bedrock Edition server written in Java. Supports custom items, blocks, entities, full vanilla commands, advanced mob AI, and world generation. Not affiliated with Mojang AB.

ch4mpy / spring-addons

OAuth2 / OIDC for Spring backends of SPAs and mobile apps: the Spring Security beans the official starters leave to you (authorities, CORS, 2xx/401 for fetch, CSRF cookie, validated redirects, logout, one refresh flow at a time), as properties.

jmdns / jmdns

Official home of the JmDNS library

SonarSource / sonarqube-mcp-server

Official SonarQube MCP Server for code quality and security in AI agents

plantuml / plantuml-stdlib

Contains official Standard Library for PlantUML

easymock / objenesis

Okay, it's pretty easy to instantiate objects in Java through standard reflection. However there are many cases where you need to go beyond what reflection provides. For example, if there's no public constructor, you want to bypass the constructor code, or set final fields. There are numerous clever (but fiddly) approaches to getting around this and this library provides a simple way to get at them. You will find the official site here.

AllTick-Official / alltick-realtime-forex-crypto-stock-tick-finance-websocket-api

AllTick real-time financial market data API with REST and WebSocket access to stocks, forex, crypto, commodities, and indices.

GregTechCEu / GregTech-Modern

GregTech CE Unofficial for modern versions

aws / aws-lambda-java-libs

Official mirror for interface definitions and helper classes for Java code running on the AWS Lambda platform.

CryptoMorin / XSeries

Library for cross-version Minecraft Bukkit support and various efficient API methods.

elastic / elasticsearch-java

Official Elasticsearch Java Client