2020-03-13: This site is going to be decommissioned and shut down very soon. Please copy and archive any data you wish to keep ASAP
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A server side workflow engine with GUI flow chart designer.
It is based on the concept of synchronisation and can model complex looping flows other engines cannot handle.
It is being used in commercial applications and is now being open sourced. It has a Turbine integration layer to control the flow of a complex web application.