Free universal database tool and SQL client

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

😱 从源码层面，剖析挖掘互联网行业主流技术的底层实现原理，为广大开发者 “提升技术深度” 提供便利。目前开放 Spring 全家桶，Mybatis、Netty、Dubbo 框架，及 Redis、Tomcat 中间件等

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

Code for Quartz Scheduler

Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.

The simple, stupid rules engine for Java

OFD Reader & Writer 开源的OFD处理库，支持文档生成、数字签名、文档保护、文档合并、转换、导出等功能，文档格式遵循《GB/T 33190-2016 电子文件存储与交换格式版式文档》。