WebSphere MQ is the IBM Message Bus implementation. The connection to the Integration Server via JNDI has been tested with the version 8.0.0 of WebSphere MQ. The WebSphere MQ server can be downloaded at the following link:
https://www.ibm.com/developerworks/community/blogs/messaging/entry/develop_on_websphere_mq_advanced_at_no_charge?lang=en
The Message Bus can be installed on a Windows or Linux system. The IBM site provides both versions. Follow the installation instructions:
http://www.ibm.com/support/knowledgecenter/SSFKSJ_8.0.0/com.ibm.mq.ins.doc/q008590_.htm