Jess is a rule engine and scripting environment written entirely in Sun's Java language. Using
Jess, you can build Java software that has the capacity to "reason" using knowledge you supply in the form of declarative rules.
Jess is small, light, and one of the fastest rule engines available. Its powerful scripting language gives you access to all of Java's APIs.
Jess includes
...Licence : Free for non-commercial use 
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