The following open source projects are referenced by Core Command Client:

Spring Framework (Apache 2.0) - http://projects.spring.io/spring-framework/
https://github.com/spring-projects/spring-framework

Jackson Core (Apache 2.0) - https://github.com/FasterXML/jackson-core/wiki
https://github.com/FasterXML/jackson-core/wiki

Resteasy, JBoss (Apache 2.0) - http://resteasy.jboss.org/
https://github.com/resteasy/Resteasy/blob/master/License.html

Spring Cloud (Apache 2.0) - http://projects.spring.io/spring-cloud/
https://github.com/spring-cloud/spring-cloud-release/blob/master/LICENSE.txt

Junit (EPL 1.0) - http://junit.org/junit4/
http://junit.org/junit4/license.html