OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.

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？

Diablo II remade using Java and LibGDX

An easy open source Android Native Game FrameWork.

Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.

An advanced theming manager designed to be used with RRO, OMS and Dynamic Overlays

Droidefense: Advance Android Malware Analysis Framework

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.

专注于解决推荐领域与搜索领域的两个核心问题:排序预测(Ranking)和评分预测(Rating). 为相关领域的研发人员提供完整的通用设计与参考实现. 涵盖了70多种排序预测与评分预测算法,是最快最全的Java推荐与搜索引擎.

rules engine

A 3D world/level editor built with Java, Kotlin & libGDX.

A modern JavaScript development environment for Minecraft.

Deploy, execute, manage process-based applications made with Bonita studio or through Engine APIs

Java 2D Game Engine

An ORM / OGM for the TinkerPop graph stack.

the unRogueEngine

Isometric game engine. Open world, block/voxel based and sprite rendering.

JVM bytecode interpreter written in Java