Imixs-Workflow - Imixs Workflow is a BPM Framework with the goal to reduce the complexity of business applications.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
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.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.