I've written an article that gives a compact overview of the open source projects, standards and commercial tools on business process management and workflow.
The reason for this publication is that a lot of companies are not even aware of the fact that there are open source alternatives for business process management.
This article intends to give those organisations a start in selecting the open source workflow engine that best fits their needs.
See : Open source workflow and the BPM-market
Do you think the mega-$$$ spend on commercial workflow tools are wurthed or would you consider an open source alternative ?