Java

liquibaseliquibase/liquibase

An open-source database schema change management tool that tracks, versions, and deploys database changes.

FastBleJasonchenlijian/FastBle

A fast development framework for Android Bluetooth Low Energy (BLE) with simplified APIs for scanning, connecting, reading, writing, and multi-device management.

Markorgsantner/markor

A versatile, offline-first text editor for Android supporting Markdown, todo.txt, and other plaintext formats for notes and task management.

Thumbnailatorcoobird/thumbnailator

A Java library for generating high-quality thumbnails with a simple fluent interface and no external dependencies.

Reboundfacebook/rebound

A Java library that models spring dynamics to add natural physics-based animations to Android and Java applications.

PMDpmd/pmd

An extensible multilanguage static code analyzer that finds common programming flaws and duplicated code across 20+ languages.

picocliremkop/picocli

A modern Java framework for building powerful, user-friendly command line applications with GraalVM native image support.

RuneLiterunelite/runelite

A free, open-source client for Old School RuneScape with plugin support and customization.

LWJGLLWJGL/lwjgl3

A lightweight Java library providing cross-platform, high-performance bindings to native APIs for graphics, audio, parallel computing, and XR.

DDDSampleciterus/dddsample-core

A reference implementation of a cargo booking system demonstrating Domain-Driven Design (DDD) patterns and practices.

Gradle Retrolambda Pluginevant/gradle-retrolambda

A Gradle plugin that enables Java 8 lambda expressions and method references in Java 6, 7, and Android projects.

Easy Rules (.2k)j-easy/easy-rules

A lightweight Java rules engine for defining and executing business rules with POJOs, annotations, and expression languages.

YCSBbrianfrankcooper/YCSB

A framework and common set of workloads for evaluating and comparing the performance of different NoSQL and cloud-serving databases.

react-native-interactablewix/react-native-interactable

A React Native library for creating high-performance, physics-based interactive views like swipeable cards and drawers.

Ottosquare/otto

An enhanced Guava-based event bus with emphasis on Android support for decoupled application communication.

armerialine/armeria

A reactive microservice framework built on Netty that supports gRPC, Thrift, Kotlin, Retrofit, Spring Boot, and Dropwizard.

Boosterdidi/booster

A lightweight, extensible quality optimization toolkit for Android applications, focusing on performance, stability, and package size reduction.

mapdbjankotek/MapDB

An embedded Java database engine providing concurrent collections backed by disk storage or off-heap memory.

apk-mitmshroudedcode/apk-mitm

A CLI tool that automatically patches Android APK files to bypass HTTPS security for traffic inspection.

orientdborientechnologies/orientdb

An open-source multi-model NoSQL DBMS supporting Graph, Document, Reactive, Full-Text, and Geospatial models in a single product.

Java FakerDiUS/java-faker

A Java library for generating fake data, ported from Ruby's Faker gem, useful for testing and development.

cglibcglib/cglib

A high-level Java bytecode generation library for creating dynamic proxies and intercepting field access.

Reactive Streamsreactive-streams/reactive-streams-jvm

A standard specification for asynchronous stream processing with non-blocking backpressure on the JVM.

MockServer (.8k)mock-server/mockserver

MockServer is an HTTP(S) mock server and proxy for mocking, recording, and debugging integrations with external systems.

micrometermicrometer-metrics/micrometer

A vendor-neutral metrics facade for Java applications, providing dimensional metrics instrumentation across popular monitoring backends.

aerosolveairbnb/aerosolve

A machine learning library designed for human interpretability, featuring debuggable models and a feature transform language.

djldeepjavalibrary/djl

An engine-agnostic deep learning framework for Java developers, providing a high-level API for model training and inference.

FXGLAlmasB/FXGL

A JavaFX-based game development framework for building 2D games and complex UI applications with a clean, high-level API.

Reflectionsronmamo/reflections

A Java library for scanning and indexing classpath metadata to enable runtime type system queries.

OpenAI-JavaTheoKanning/openai-java

A Java client library for OpenAI's GPT APIs, including GPT-3, ChatGPT, and GPT-4.

JSON-javastleary/JSON-java

A reference implementation of a JSON package in Java for parsing, generating, and converting JSON documents.

JavaCPPbytedeco/javacpp

A Java library providing efficient, zero-overhead access to native C++ code using JNI and annotations.

JDADV8FromTheWorld/JDA

A Java wrapper for the Discord API, enabling developers to create scalable and feature-rich Discord bots.

JDADV8FromTheWorld/JDA

A Java library for building Discord bots using the real-time gateway and REST API with event-driven architecture.

Simplify Android deobfuscatorCalebFenton/simplify

A generic Android deobfuscator that uses virtual execution to simplify obfuscated code for human analysis.

GCViewerchewiebug/GCViewer

A Java tool that visualizes and analyzes verbose garbage collection logs from multiple JVM vendors to help optimize memory performance.