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Activiti
Activiti an open-source workflow engine written in Java that can execute business processes described in BPMN 2.0. Activity is indeed the foundation for Alfresco’s Alfresco Process Services (APS), and Alfresco is the project’s leading sponsor. Tom Baeyens and Joram Barrez, the two developers for jBPM left Red Hat and started Activity as employees of Alfresco. Activity is based on their workflow experience with jBPM but is a new code base, not based on any previous jBPM code. The first version was 5.0, to indicate that product is the continuation of experience they gained via jBPM 1 through 4.
In October 2016, Barrez, Rademakers and other contributors left Alfresco. The departing developers forked the Activiti code to start a new project called Flowable. As a result, In February 2017, new commercial version of Activiti released and rebranded as Alfresco Process Services. In May 2017, Activiti released version 6.0.0 with new support for ad-hoc subprocesses and a new application user interface.