UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
Camunda - The Universal Process Orchestrator
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Bizagi - Bizagi is a Business Process Management (BPMS) solution for faster and flexible process automation. It's powerful yet intuitive BPM Suite is designed to make your business more agile.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.
Celonis - Celonis offers process mining tool for analyzing & visualizing business processes.