open source bpm

http://www.processmaker.com/

http://www.cuteflow.org/index.html

http://www.bonitasoft.com/

http://kaizaramin.com/2009/04/28/open-source-bpm-applications/

http://www.jboss.com/products/jbpm/

http://www.intalio.com/ - free

Apache Agila