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Excellent Decision Table based Rules Engine implementation in Java
DT4J is a Java implementation of Decision Table based rules engine. It supports excel based and an editor based Decision Table authoring. It integrates with Spring expressions (SpEL) to express conditions and actions. Put together it's a power rules engine.
Popular Open Source Business Decision Management System
OpenRules - a full-scale open source Business Decision Management System. Enables business analysts & software developers to work together creating and maintaining complex Rules-based decsion support applications. Supported from WWW.OPENRULES.COM
A graphical editor based on Visual Syntax of Semantics for Business Vocabulary and Rules(SBVR). SBVR VE is based on eclipse platform. For documentation, please refer to OPAALS deliverable http://files.opaals.org/OPAALS/Year_3_Deliverables/WP10/D10.14.pdf
jSemanticService is a lightweight framework that allows to use Rules and Semantics in Services or Applications using Annotations. Features: jBoss Rules (Drools 4.0) as Business Rules Engine provider. Full support of Annotations, Spring, Flex/Blaze DS.