iluwatar / java-design-patterns

Design patterns implemented in Java

ReactiveX / RxJava

RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

bumptech / glide

An image loading and caching library for Android focused on smooth scrolling

zxing / zxing

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

google / gson

A Java serialization/deserialization library to convert Java Objects into JSON and back

ben-manes / caffeine

A high performance caching library for Java

Tencent / tinker

Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstall apk.

mockito / mockito

Most popular Mocking framework for unit tests written in Java

deeplearning4j / deeplearning4j

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...

langchain4j / langchain4j

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.

resilience4j / resilience4j

Resilience4j is a fault tolerance library designed for Java8 and functional programming

flyway / flyway

Flyway by Redgate • Database Migrations Made Easy.

testcontainers / testcontainers-java

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.

react-native-image-picker / react-native-image-picker

:sunrise_over_mountains: A React Native module that allows you to use native UI to select media from the device library or directly from the camera.

dropwizard / dropwizard

A damn simple library for building production-ready RESTful web services.

dropwizard / metrics

:chart_with_upwards_trend: Capturing JVM- and application-level metrics. So you know what's going on.

raphw / byte-buddy

Runtime code generation for the Java virtual machine.

graphhopper / graphhopper

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

lightbend / config

configuration library for JVM languages using HOCON files

vavr-io / vavr

vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.

mik3y / usb-serial-for-android

Android USB host serial driver library for CDC, FTDI, Arduino and other devices.

liquibase / liquibase

Main Liquibase Source

TommyLemon / Android-ZBLibrary

🔥 Android MVP 快速开发框架，做国内 「示例最全面」「注释最详细」「使用最简单」「代码最严谨」的 Android 开源 UI 框架。 🔥 An Android MVP Framework with many demos, detailed documents, simple usages and strict codes.

rubenlagus / TelegramBots

Java library to create bots using Telegram Bots API

LFDT-web3j / web3j

Lightweight Java and Android library for integration with Ethereum clients

zhkl0228 / unidbg

Allows you to emulate an Android native library, and an experimental iOS emulation

bitcoinj / bitcoinj

A library for working with Bitcoin

line / armeria

Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.

deepjavalibrary / djl

An Engine-Agnostic Deep Learning Framework in Java

jacoco / jacoco

:microscope: Java Code Coverage Library

grimmory-tools / grimmory

A self-hosted library for your ebooks, comics, and audiobooks

apache / shiro

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management

alibaba / fastjson2

🚄 FASTJSON2 is a Java JSON library with excellent performance.

LibrePDF / OpenPDF

OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL.

knowm / XChange

XChange is a Java library providing a streamlined API for interacting with 60+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data.

kubernetes-client / java

Official Java client library for kubernetes

TNG / ArchUnit

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

apache / logging-log4j2

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

docker-java / docker-java

Java Docker API Client

MewX / light-novel-library_Wenku8_Android

[CASUALLY MAINTAINED] 轻小说文库 (Wenku8.com) 安卓版第三方公益App，始于2014年的初版Material Design风格、非盈利、Play Store上安装包最小的轻小说阅读器 (light novel reader)。目前网站的API由于被大量滥用，已更新成我自己架的 Cloudflare Worker API 中继节点，不然的话网站关闭API就全军覆没了。

apache / pdfbox

Mirror of Apache PDFBox

bucket4j / bucket4j

Java rate limiting library based on token-bucket algorithm.

google / truth

Fluent assertions for Java and Android

Kong / unirest-java

Unirest in Java: Simplified, lightweight HTTP client library.

commonmark / commonmark-java

Java library for parsing and rendering CommonMark (Markdown)

vladmihalcea / hypersistence-utils

The Hypersistence Utils library (previously known as Hibernate Types) gives you Spring and Hibernate utilities that can help you get the most out of your data access layer.

mongodb / mongo-java-driver

The official MongoDB drivers for Java, Kotlin, and Scala

apache / casbin-jcasbin

An authorization library that supports access control models like ACL, RBAC, ABAC in Java

dlew / joda-time-android

Joda-Time library with Android specialization

apache / logging-flume

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

firebase / firebase-android-sdk

Firebase Android SDK

ta4j / ta4j

A Java library for technical analysis.

zeromq / jeromq

JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.

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

plutext / docx4j

JAXB-based Java library for Word docx, Powerpoint pptx, and Excel xlsx files

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

prometheus / client_java

Prometheus instrumentation library for JVM applications

apache / poi

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

itext / itext-java

iText for Java represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText can be a boon to nearly every workflow.