Check this logical process flowcharts: http://flow.oodupinc.com/.
The usage example http://oodupinc.blogspot.com/.
It's collaborative, free and you can manage the node descriptions independently from flowcharts and use them in the modular system of flowcharts. Moreover, you get XML specification of the flowcharts to generate rich graphical application (HTML+SVG+CSS) or other manipulations. Currently, new users have to request a user account through email. The flowchart is drawn from specification using the flowcharting rules like links flow to down and right.
