Workflow Engines
Links- Java Open Source Workflow Engines
Updated Sept 16 2008: Note that this is not a complete list of Java workflow applications, just the ones that I have found and interest me.
Links - PHP Workflow/Process Engines
Updated: June 20 2008
Galaxia is an activity-based workflow application, where the processes and the workflows are made of dynamic activities that must be completed to finish a task. Contrast this with a procedural system where each step in the process must be completed in order, and the power of this application becomes clear.
Links - Drupal Workflow Project
The game's a foot.
From the Workflow-NG project page, a list of Drupal 5 modules that integrate with Workflow-NG ( other than Workflow ):
Links - Business Process Execution Language
Updated Sept 12 2008: moved page to Home site ( it's a standard, not a project or product ).
See "Links - Business Process Execution Language on the Home site".