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Logician is a JavaScript and C++ cross-platform DecisionTable and XML based Rules Engine. Decision tables provide an efficient, easy way for expressing complex rules and deploying to the client on both the desktop and in a web browser.
Excellent DecisionTable based Rules Engine implementation in Java
DT4J is a Java implementation of DecisionTable based rules engine. It supports excel based and an editor based DecisionTable authoring. It integrates with Spring expressions (SpEL) to express conditions and actions. Put together it's a power rules engine.