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Open Source Rule Engines Written In Java » What do you think about these?
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QuickRules Standard Edition 4.0 (http://www.yasutech.com) QuickRules (Java/J2EE) is an integrated graphical Business Rules development environment that reduces maintenance and enhancement costs by cleanly separating business rules from application code. This release of QuickRules Business Rules Engine comes with lots of productivity enhancements that make rule development intuitive, and its validations help detect errors and conflicts automatically. QuickRules Builder is now available as a set of customizable Eclipse Plugins.
can be downloaded at http://www.yasutech.com/downloads