Camunda - The Universal Process Orchestrator
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
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.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
jBPM - jBPM is a flexible Business Process Management (BPM) Suite.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.