Best Open Source java Libraries
A curated list of the most popular GitHub repositories tagged with java. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1CyC2018/CS-Notes
:books: 技术面试必备基础知识、Leetcode、计算机操作系统、计算机网络、系统设计
#2Snailclimb/JavaGuide
Java 面试 & 后端通用面试指南，覆盖计算机基础、数据库、分布式、高并发与系统设计。准备后端技术面试，首选 JavaGuide！
#3iluwatar/java-design-patterns
Design patterns implemented in Java
#4macrozheng/mall
mall项目是一套电商系统，包括前台商城系统及后台管理系统，基于Spring Boot+MyBatis实现，采用Docker容器化部署。 前台商城系统包含首页门户、商品推荐、商品搜索、商品展示、购物车、订单流程、会员中心、客户服务、帮助中心等模块。 后台管理系统包含商品管理、订单管理、会员管理、促销管理、运营管理、内容管理、统计报表、财务管理、权限管理、设置等模块。
#5spring-projects/spring-boot
Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.
#6doocs/advanced-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
#7elastic/elasticsearch
Free and Open Source, Distributed, RESTful Search Engine
#8Stirling-Tools/Stirling-PDF
#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere
#9TheAlgorithms/Java
All Algorithms implemented in Java
#10kdn251/interviews
Everything you need to know to get the job.
#11youngyangyang04/leetcode-master
《代码随想录》LeetCode 刷题攻略：200道经典题目刷题顺序，共60w字的详细图解，视频难点剖析，50余张思维导图，支持C++，Java，Python，Go，JavaScript等多语言版本，从此算法学习不再迷茫！🔥🔥 来看看，你会发现相见恨晚！🚀
#12azl397985856/leetcode
LeetCode Solutions: A Record of My Problem Solving Journey.( leetcode题解，记录自己的leetcode解题之路。)
#13google/guava
Google core libraries for Java
#14dbeaver/dbeaver
Free universal database tool and SQL client
#15ReactiveX/RxJava
RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
#16skylot/jadx
Dex to Java decompiler
#17square/okhttp
Square’s meticulous HTTP client for the JVM, Android, and GraalVM.
#18GitHubDaily/GitHubDaily
坚持分享 GitHub 上高质量、有趣实用的开源技术教程、开发者工具、编程网站、技术资讯。A list cool, interesting projects of GitHub.
#19square/retrofit
A type-safe HTTP client for Android and the JVM
#20apache/spark
Apache Spark - A unified analytics engine for large-scale data processing
#21apache/dubbo
The java implementation of Apache Dubbo. An RPC and microservice framework.
#22appsmithorg/appsmith
Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.
#23PhilJay/MPAndroidChart
A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, panning and animations.
#24alibaba/arthas
Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas
#25AobingJava/JavaFamily
【Java面试+Java学习指南】 一份涵盖大部分Java程序员所需要掌握的核心知识。
#26doocs/leetcode
🔥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
#27xkcoding/spring-boot-demo
🚀一个用来深入学习并实战 Spring Boot 的项目。
#28SeleniumHQ/selenium
A browser automation framework and ecosystem.
#29zxing/zxing
ZXing ("Zebra Crossing") barcode scanning library for Java, Android
#30alibaba/easyexcel
快速、简洁、解决大文件内存溢出的java处理Excel工具
#31binarywang/WxJava
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
#32conductor-oss/conductor
Conductor is an event driven agentic orchestration platform providing durable and highly resilient execution engine for applications and AI Agents
#33ityouknow/spring-boot-examples
about learning Spring Boot via examples. Spring Boot 教程、技术栈示例代码，快速简单上手教程。
#34chinabugotech/hutool
🍬A set of tools that keep Java sweet.
#35xuxueli/xxl-job
A distributed task scheduling framework.（分布式任务调度平台XXL-JOB）
#36square/leakcanary
A memory leak detection library for Android.
#37alibaba/spring-cloud-alibaba
Spring Cloud Alibaba provides a one-stop solution for application development for the distributed solutions of Alibaba middleware.
#38yuliskov/SmartTube
Browse media content with your own rules on Android TV
#39crossoverJie/JCSprout
👨🎓 Java Core Sprout : basic, concurrent, algorithm
#40Anuken/Mindustry
The automation tower defense RTS
#41kestra-io/kestra
Event Driven Orchestration & Scheduling Platform for Mission Critical Applications
#42forthespada/CS-Books
🔥🔥超过1000本的计算机经典书籍、个人笔记资料以及本人在各平台发表文章中所涉及的资源等。书籍资源包括C/C++、Java、Python、Go语言、数据结构与算法、操作系统、后端架构、计算机系统知识、数据库、计算机网络、设计模式、前端、汇编以及校招社招各种面经~
#43apache/flink
Apache Flink
#44alibaba/fastjson
FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
#45google/flatbuffers
FlatBuffers: Memory Efficient Serialization Library
#46hollischuang/toBeTopJavaer
To Be Top Javaer - Java工程师成神之路
#47NativeScript/NativeScript
⚡ Write Native with TypeScript ✨ Best of all worlds (TypeScript, Swift, Objective C, Kotlin, Java, Dart). Use what you love ❤️ Angular, React, Solid, Svelte, Vue with: iOS (UIKit, SwiftUI), Android (View, Jetpack Compose), Flutter and you name it compatible.
#48jenkinsci/jenkins
Jenkins automation server
#49libgdx/libgdx
Desktop/Android/HTML5/iOS Java game development framework
#50redisson/redisson
Redisson - Valkey & Redis Java client. Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache..