MSMQ Message Viewer?
MSMQ QXplorer
Free. Open source.
https://sourceforge.net/projects/msmqqxplorer/
There are a few options - all I found are commercial (not terribly expensive, but not free, either):
- Mqueue Viewer (free)
- Mulholland Q Set
- QueueExplorer
If you are using Visual Studio - Open Server Explorer under Servers/[Server Name] there is Message Queues folder that gives you view as well.