HermesJMS is a graphical tool for working with JMS providers letting you create and send messages; view messages on queues and topics; save messages to your local disk for editing and later resubmission - and lots more.
http://www.hermesjms.com/confluence/display/HJMS/Home
As well as a lot of bug fixes notable improvements include the editing of messages before you send them and those in message stores; better MacOSX support; HornetQ and QPID plugins and support for FIX 5.0 message rendering.
http://hermesjms.com/confluence/display/HJMS/Sending+a+Message
http://hermesjms.com/confluence/display/HJMS/Editing+Messages+in+a+Message+Store
Release notes are at http://hermesjms.com/confluence/display/HJMS/Release+Notes
Regards,
Colin.