====== Drools Rule Engine ======
  * https://www.drools.org/
  * [[http://www.tutorialspoint.com/drools/|Drools Tutorial]]
  * [[http://www.baeldung.com/drools|Introduction to Drools]]
  * [[http://www.baeldung.com/drools-excel|Drools Using Rules from Excel Files]]
  * [[http://www.baeldung.com/drools-spring-integration|Drools Spring Integration]]