The best replacement for ibm mq is jms.

The best alternatives to ibm mq are rated as following:
★★★★★  jms
★★★★  tibco ems
★★★  activemq
★★★  msmq
★  oracle aq
★  tibco
  websphere mq

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Speaking about ibm mq, one probably shouldn't forget about spring jms.

Other search terms related to ibm mq and their ratings are:
★★★★★ spring jms
★★★ spring integration
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Google Trends

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