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Open Source graphical XPDL Java Workflow Editor
Enhydra JaWE (Java Workflow Editor) is the first open source graphical Java workflow process editor fully according to WfMC specifications supporting XPDL as its native file format. It can be used to edit / view every XPDL file which conforms to WfMC XPDL specifications and is available in many different languages already.

Advanced features like the consistency validation and guided property editor dialogs for all XPDL objects make it really easy to create valid XPDL files.

The representation of workflow participants as "swimlanes" in the editor graphics gives a comprehensive overview of process responsibilities.

Together Workflow Editor Professional
An extended commercial version of the JaWE project is available as Together Workflow Editor Professional. Check out the additional features available for high end XPDL workflow modelling !