I’ve created open source Business Process Management solution using Vaadin Framework for UI and Bonita BPM as an engine. Now it’s easy to create amazing UI-forms for Human-Tasks and load them as JAR files to Application server.
It works and seems very pretty.
I would suggest to release Processbase as an appliance.
A good start could be this Turnkey core Linux appliance http://www.turnkeylinux.org/core on which to install Glassfish / Bonita / Vaadin / Liferay
That would be a great way for testers & developers to use it in a virtual environment or even deploy it in a production environment.