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DTRules is an open source, Decision Table based Rules Engine.  It is the third version of an approach used in many states to implement policy since 2001.  

Decision Tables are a very powerful way of expressing policy, and for building decision support systems.

See the project website at DTRules.com

Become a member here, and register an account at DTRules.com.  This way, you can keep up with changes and updates on the project!