Groovy 是一种基于 JVM 的敏捷开发语言，它结合了Python、Ruby和Smalltalk的许多强大的特性。

Apache Shiro是一个强大且易用的Java安全框架,执行身份验证、授权、密码和会话管理

Hudi 于 2016 年以“Hoodie”为代号开发，旨在解决 Uber 大数据生态系统中需要插入更新及增量消费原语的摄取管道和 ETL 管道的低效问题

Jackrabbit Oak is a scalable, high-performance hierarchical content repository designed for use as the foundation of modern world-class web sites and other demanding content applications.

Apache Commons Weaver 提供了一种通过生成（“weaving”）字节码到这些类中来增强已编译 Java 类的简便方法

Apache BookKeeper 是一个可以方便扩展，高可用，低延迟的存储系统

Apache Avro™ is a data serialization system.

Apache CXF is an open source services framework. CXF helps you build and develop services using frontend programming APIs, like JAX-WS and JAX-RS. These services can speak a variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work ov...

The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

Apache Flink 是高效和分布式的通用数据处理平台

Apache NiFi is an easy to use, powerful, and reliable system to process and distribute data.

Apache Camel 是一个非常强大的基于规则的路由以及媒介引擎，该引擎提供了一个基于POJO的 企业应用模式(Enterprise Integration Patterns)的实现，你可以采用其异常强大且十分易用的API (可以说是一种Java的领域定义语言 Domain Specific Language)来配置其路由或者中介的规则

Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.

Tika 是一个内容抽取的工具集合(a toolkit for text extracting)。它集成了 POI, Pdfbox 并且为文本抽取工作提供了一个统一的界面。

Tomcat 是一个小型的轻量级应用服务器，在中小型系统和并发访问用户不是很多的场合下被普遍使用，是开发和调试JSP 程序的首选。