objectbox / objectbox-java

Database for Android and JVM - first and fast, lightweight on-device vector database

crate / crate

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

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/

fishercoder1534 / Leetcode

Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more.

IrisShaders / Iris

A modern shaders mod for Minecraft compatible with existing OptiFine shader packs

Atmosphere / atmosphere

Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.

dtinit / data-transfer-project

The Data Transfer Project makes it easy for platforms to build interoperable user data portability features. We are establishing a common framework, including data models and protocols, to enable direct transfer of data both into and out of participating online service providers.

ukanth / afwall

AFWall+ (Android Firewall +) - iptables based firewall for Android

apache / paimon

Apache Paimon is a lake format that enables building a Realtime Lakehouse Architecture with Flink and Spark for both streaming and batch operations.

apache / linkis

Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.

internetarchive / heritrix3

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project.

qos-ch / logback

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

androidx / media

Jetpack Media3 support libraries for media use cases, including ExoPlayer, an extensible media player for Android

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)

apache / logging-flume

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

JakeWharton / RxRelay

RxJava types that are both an Observable and a Consumer.

metasfresh / metasfresh

We do Open Source ERP - Fast, Flexible & Free Software to scale your Business.

nordicsemi / Android-BLE-Library

A library that makes working with Bluetooth LE on Android a pleasure. Seriously.

igniterealtime / Smack

A modular and portable open source XMPP client library written in Java for Android and Java (SE) VMs

kongzue / DialogX

💬 DialogX dialog box component library, easy to use, more customizable, more scalable, easy to achieve a variety of dialog boxes. DialogX对话框组件库，更加方便易用，可自定义程度更高，扩展性更强，轻松实现各种对话框、菜单和提示效果，更有Material You、iOS、MIUI等主题扩展可选

innoveit / react-native-ble-manager

React Native BLE communication module

FormidableLabs / react-native-app-auth

React native bridge for AppAuth - an SDK for communicating with OAuth2 providers

onthegomap / planetiler

Flexible tool to build planet-scale vector tilesets from OpenStreetMap data fast

apache / polaris

Apache Polaris, the interoperable, open source catalog for Apache Iceberg

zalando / logbook

An extensible Java library for HTTP request and response logging

apache / bookkeeper

Apache BookKeeper - a scalable, fault tolerant and low latency storage service optimized for append-only workloads

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.

openaudible / openaudible

Audiobook Manager for Audible Users

TimefoldAI / timefold-solver

The open source Solver AI for Java and Kotlin to optimize scheduling and routing. Solve the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning problems.

embulk / embulk

Embulk: Pluggable Bulk Data Loader.

dingodb / dingo

A multi-modal vector database that supports upserts and vector queries using unified SQL (MySQL-Compatible) on structured and unstructured data, while meeting the requirements of high concurrency and ultra-low latency.

babyfish-ct / jimmer

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

batfish / batfish

Batfish is a network configuration analysis tool that can find bugs and guarantee the correctness of (planned or current) network configurations. It enables network engineers to rapidly and safely evolve their network, without fear of outages or security breaches.

bootique / bootique

Bootique is a minimally opinionated platform for modern runnable Java apps.

aliyun / aliyun-openapi-java-sdk

The Alibaba Cloud V1.0 SDK will soon enter the Basic Security Maintenance phase and is no longer recommended for use. V2.0 SDK is available here: https://github.com/aliyun/alibabacloud-java-sdk

apache / rocketmq-dashboard

The state-of-the-art Dashboard of Apache RoccketMQ provides excellent monitoring capability. Various graphs and statistics of events, performance and system information of clients and application is evidently made available to the user.

LSPosed / DisableFlagSecure

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infinispan / infinispan

Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

GoogleCloudPlatform / DataflowTemplates

Cloud Dataflow Google-provided templates for solving in-Cloud data tasks

apache / incubator-xtable

Apache XTable (incubating) is a cross-table converter for lakehouse table formats that facilitates interoperability across data processing systems and query engines.

bbottema / simple-java-mail

Simple API, Complex Emails (Jakarta Mail smtp wrapper)

pnoker / iot-dc3

IoT DC3 — Connect the Physical World to AI. An open-source Industrial IoT Runtime for Physical AI: 36 protocol drivers, edge-to-cloud data delivery, and an MCP tool gateway so AI agents act on devices in a safe, controllable, traceable loop.

OpenLiberty / open-liberty

Open Liberty is a highly composable, fast to start, dynamic application server runtime environment

tony19 / logback-android

📄The reliable, generic, fast and flexible logging framework for Android

zinggAI / zingg

Scalable master data management, identity resolution, entity resolution, and deduplication using ML

sakaiproject / sakai

Sakai is a freely available, feature-rich technology solution for learning, teaching, research and collaboration. Sakai is an open source software suite developed by a diverse and global adopter community.

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.

oldratlee / fucking-java-concurrency

🎏 Simple showcases of java concurrency problems, seeing 🙈 is believing 🐵

PebbleTemplates / pebble

Java Template Engine

castorini / anserini

Anserini is a Lucene toolkit for reproducible information retrieval research

javapackager / JavaPackager

Gradle/Maven plugin to package Java applications as native Windows, MacOS, or Linux executables and create installers for them.

pentaho / mondrian

Mondrian is an Online Analytical Processing (OLAP) server that enables business users to analyze large quantities of data in real-time.

typetools / checker-framework

Pluggable type-checking for Java

BlackyHawky / Clock

Customizable, privacy‑first, open-source clock app inspired by AOSP Clock

davidmoten / rtree

Immutable in-memory R-tree and R*-tree implementations in Java with reactive api

apache / ofbiz-framework

Apache OFBiz is an open source product for the automation of enterprise processes. It includes framework components and business applications for ERP, CRM, E-Business/E-Commerce, Supply Chain Management and Manufacturing Resource Planning. OFBiz provides a foundation and starting point for reliable, secure and scalable enterprise solutions.

hivemq / hivemq-mqtt-client

HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

hardcore-sushi / DroidFS

Encrypted overlay filesystems implementation for Android. Also available on Tangled.

googlesamples / android-testdpc

Test DPC is a sample device policy controller for use with Android Enterprise. It gives developers the ability to see how their app will behave in a managed context such as device owner or within a managed profile. Users can set up a work profile, enable work apps, set applications restrictions, manage security polices, and much more. The app also serves as a implementation reference for other DPCs

lacuna / bifurcan

functional, durable data structures