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