Yes, there are a ton of Message Broker products out there. We refer to these as MOM (Message Oriented Middleware) products. Some examples of the most used/well known ones are Websphere MQ, Sonic MQ, and MSMQ. Furthermore, any product that implements the JMS API is a Message Broker.
Joined: Aug 10, 2001
Actually no. Generic MOM products don't act as a message broker per se -- they allow you to connect to a message broker (or any other application) through a messaging system using an API like JMS. Now, all of the vendors you mention also offer commercial message broker products -- for instance, the one from IBM is called WebSphere Business Integration Message Broker ( see here). There are similar products available from Sonic, TIBCO, and others.