Drools

http://touk.pl/blog/en/2010/05/19/introducing-camel-drools-component/

http://blog.csdn.net/quzishen/article/details/6163012?reload

http://wiki.ruleml.org/index.php/RuleML_Home

http://www.pst.com/opsj.html

http://www.java-gaming.org/index.php?topic=5838.0