The Top 10 Java Open Source Projects

Ghidra is a software reverse engineering (SRE) framework

All Algorithms implemented in Java

《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现

Free universal database tool and SQL client

AI 低代码平台「低代码 + 零代码」双驱动！低代码可一键生成前后端代码;零代码可 5 分钟搭建系统;AI Skills 一句话画流程、设计表单、生成整套系统。内置 AI聊天、知识库、流程编排、MCP插件等，兼容主流大模型。引领「AI 生成 → 在线配置 → 代码生成 → 手工合并->AI修改」开发模式，消除 Java 项目 80% 的重复工作，提效而不失灵活。

OkHttp is a production-focused HTTP client from Square for JVM, Android, and GraalVM workloads. You use it when you need reliable HTTP/1.1 and HTTP/2 behavior, connection reuse, TLS support, request/response interception, and predictable timeout controls in one library. The source repository is GitHub, and the official API and usage docs live at square.github.io/okhttp.

You get a low-level client that stays close to HTTP mechanics while still giving you practical conveniences like pooled connections, transparent compression support, and a composable interceptor model. That makes it suitable for mobile API calls, JVM service-to-service calls, and custom SDK integrations where you need deterministic request behavior.

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

A curated list of awesome frameworks, libraries and software for the Java programming language.

Apache Spark - A unified analytics engine for large-scale data processing

Dex to Java decompiler