jBPM BPEL
JBoss
http://www.jboss.org/jbossjbpm/
1.1.1, released 2008-08-12.
The product implements BPEL standard. I didn't find info about limitations nor extensions.
jBPM requires a J2EE 1.4 server. Of course, JBoss is the recommended one. It uses hibernate for persistance.
jBPM uses the Process Virtual Machine (PVM) as core runtime engine. This engine is shared internally with other subprojects: jPDL and pageflow. This is algo the engine used by OW2 Orchestra.
Image source: http://www.jboss.org/file-access/default/members/jbossjbpm/images/bpel_overview.png
I didn't find it.
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It includes a very basic administrative console.
The project doesn't include this tools. You can use tools available from other projects, like Eclipse.
The documentation is clear and well organized, but a little bit short in a lot of important things.
The forum is common for the whole jBPM project, so traffic is high and there's a lot of activity. Mailing list, is also shared and high traffic (about 300 messages/month).
Through lists and forums.
You can get payed support from JBoss.
I didn't find it. But looking at the bugtracking system, all incidents are assigned to a single person, and I couldn't see any activity in this year.
I didn't find it.