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Camunda - The Universal Process Orchestrator
Sheep - Membership and events for SMEs and nonprofits
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.
DbFace - DbFace is an online database application & report building tool.
jBPM - jBPM is a flexible Business Process Management (BPM) Suite.