For tests of JMS in WebSphere I have downloaded the developer version of WebSphere AS 8.0.
Is WebSphere MQ (which is available as a separate product from IBM) already included in this version, or does WAS use a different JMS provider?
Update: I know that in the (Apache Geronimo based) IBM WASCE (the 'community edition'), Apache ActiveMQ is used as the default JMS provider.
Which product is used in WAS 8.0 / 8.5, a proprietary IBM product or an open source product like ActiveMQ as suggested in the answer below?
Websphere AS comes with its own JMS provider as required by Java EE 6.
The provider isn't MQ. It could be a modified version of ActiveMQ or any other JMS compliant implementation.