URULE是一款基于RETE算法的纯Java规则引擎，提供规则集、决策表、决策树、评分卡，规则流等各种规则表现工具及基于网页的可视化设计器，可快速开发出各种复杂业务规则。

实时风控引擎(Risk Engine)，自定义规则引擎（Rule Script），完美支持中文，适用于反欺诈(Anti-fraud)应用场景，开箱即用！！！移动互联网时代的风险管理利器，你 Get 到了吗？

Event Ruler is a Java library that allows matching many thousands of Events per second to any number of expressive and sophisticated rules.

最好使用的规则引擎之一，可以直接使用SQL语句定义规则，简化了编码的负荷，也可以使用XML， drl文件配置规则，还支持drools文件导入。One of the best rule engines, is easy to use SQL statements to define rules, simplify the workload of coding, it also can use XML, DRL file to configure rules, and support import drools file directly.

目标是提供一个完整的Java机器学习(Machine Learning/ML)框架,作为人工智能在学术界与工业界的桥梁. 让相关领域的研发人员能够在各种软硬件环境/数据结构/算法/模型之间无缝切换. 涵盖了从数据处理到模型的训练与评估各个环节,支持硬件加速和并行计算,是最快最全的Java机器学习库.

JUnit TestRule for Android instrumented tests, which automatically disables and enables animations

为了广泛支持营销活动的复杂与灵活，Wonder8.promotion 🀎引擎使用专门设计的表达式高度提炼信息，可以轻松表达营销活动与用户选取的商品组合之间匹配范围、要求、折扣方式，可以设定多条营销规则的逻辑联合、分组、优先级，并且支持多种为用户计算最优折扣的策略。

ExprEngine compiles a string of expression to java bytecode in memory at runtime

具有简单、灵活、可复用、可编排、可配置特定场景等特性的规则引擎

Components of PSOATransRun system

Sample for CXX custom rule: This plugin adds a custom rule to the cxx plugin of SonarQube.

MyRule Engine is a Java rules engine inspired in EasyRule.

vRules4j--The best completely Object Oriented Java Object Validation/Decision Rule engine,which is born for taking over all validation responsibility in java business-enterprise industry and looking forward to providing Perfect/Lightweight solution.

@jQAssistant plugin for interpreting PlantUML diagrams as executable rules.

一个轻量级的高性能规则引擎，适用于物联网等高并发场景

A method to calculate a bounding sphere in 3D-space by geometrical rules

串行规则执行器

Simple Java Rule Engine Library