Imixs-Workflow - Imixs Workflow is a BPM Framework with the goal to reduce the complexity of business applications.
Nintex - Cloud-based digital workflow management automation platform
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.
dapulse - Lead by showing your team the Big Picture. Get everyone working together on what's important.
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.
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.