Termux - a terminal emulator application for Android OS extendible by variety of packages.
Reverse-engineer any Android TV / Google TV: 100% fail-safe direct boot launcher, remote hotkey remapping, Realtek hardware passthrough & offline media player.
Open-source OMR and guided music practice: turn sheet music PDFs/images into MusicXML/MIDI, refine scores, and practice with MIDI or microphone feedback.
Instagram without Reels, feed or ads: an open-source, updatable Instagram app for Android that keeps DMs and stories.
Arabic home screen and Saudi screensaver for Android TV / Google TV, plus a safe speed-up. Your AI agent sets it all up. واجهة عربية وشاشة توقف سعودية لتلفزيونات أندرويد، يركّبها لك مساعد الذكاء الاصطناعي.
Design patterns implemented in Java
😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲:涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识
All Algorithms implemented in Java
A type-safe HTTP client for Android and the JVM
🔥LeetCode solutions in any programming language | 多种编程语言实现 LeetCode、《剑指 Offer(第 2 版)》、《程序员面试金典(第 6 版)》题解
微信开发 Java SDK ,支持包括微信支付,开放平台,小程序,企业微信,视频号,公众号等的后端开发
Event Driven Orchestration & Scheduling Platform for Mission Critical Applications
The automation tower defense RTS
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
Jenkins automation server
Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀
A high performance caching library for Java
The ZAP by Checkmarx Core project
Quarkus: Supersonic Subatomic Java.
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
No clever tagline needed.
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.
Change data capture for a variety of databases. Please log issues at https://github.com/debezium/dbz/issues.
Apache ZooKeeper
jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.
Java JWT: JSON Web Token for Java and Android
Diskless Kafka® on S3. 10x Cost-Effective. No Cross-AZ Traffic Cost. Autoscale in seconds. Single-digit ms latency. Multi-AZ Availability.
Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.
CoreNLP: A Java suite of core NLP tools for tokenization, sentence segmentation, NER, parsing, coreference, sentiment analysis, etc.
Feign makes writing java http clients easier
Views and Drawable for displaying animated GIFs on Android
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
Apache Iceberg
A full-featured package manager and viewer for Android
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.
Free and open log management
A rewrite of Tachiyomi for the Desktop
Open source GPS tracking platform - self-hosted or managed, 200+ device protocols
An annotation processor for generating type-safe bean mappers
Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API
A tool for mocking HTTP services
A RecyclerView(advanced and flexible version of ListView in Android) with refreshing,loading more,animation and many other features.
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Statistical Machine Intelligence & Learning Engine
Apache KIE (Knowledge Is Everything) is the home of Drools, OptaPlanner, jBPM, and Kogito.
Text editor - Notes & ToDo (for Android) - Markdown, todo.txt, plaintext, math, ..
Apache NiFi
Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.
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.
Production-safe dynamic tracing and diagnostics for Java applications—attach to live JVMs with no restart or recompilation.
Apache Kafka® running on Kubernetes
A high-performance rendering engine replacement for Minecraft, which greatly improves frame rates and reduces micro-stutter
QLExpress is a powerful, lightweight, dynamic language for the Java platform aimed at improving developers’ productivity in different business scenes.
Main Liquibase Source
An extensible multilanguage static code analyzer.
Apache Maven core
A machine learning software for extracting information from scholarly documents
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.
OpenGrok is a fast and usable source code search and cross reference engine, written in Java