Camunda - The Universal Process Orchestrator
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
SyncTree - SyncTree is a SaaS-based Super Connecting Platform that connects any services you want
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
jBPM - jBPM is a flexible Business Process Management (BPM) Suite.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.