RunaWFE - RunaWFE Free is a free Open Source BPMS (business process management system), which serves to optimize and automate business processes (for Windows, Linux, Mac OS).
PowerDMS - PowerDMS provides a cloud-based solution that helps reduce risk and maintaining compliance for organizations.
Camunda - The Universal Process Orchestrator
SAI360 - GRC Platforms
Joget.org - Open Source Workflow Software, Business Process Management and Low-Code Application Platform.
ConvergePoint Policy Management - Policy Lifecycle Management on Office 365 SharePoint