I have fallen in love with FlowDesigner.
I have been thinking about making a framework in php. If following that road, i would like it to be able to generate code from a flow diagram a lot like that from FlowDesigner. Besides that use a O/R Mapper, type hints for the inputs in the flow designer, as well some post checks on the outputs.
Something also useful would be an automatic population of nodes from functions found in the framework directories.