Software For Creating Data Flow Diagrams?

[Richard Lewis <tech44writer -at- yahoo -dot- com>]

Hi all:
   
  I am using data flow diagrams as the basis for what will ultimately be a automated graphics driven tool to help developers, help desk, etc.  go from the general to the specific in understanding company systems.  I currently have child diagrams that go down to 3 to 4 levels (about 40 diagrams).  I anticipate ultimately drilling down to about 5 or 6 levels (about 60 diagrams).  Are there any other tools for doing data flow diagrams besides Visio.  In particular, a tool that supports the decomposition of data flows between parent and child diagrams would really help.
   
  Thanks,
   
  Richard Lewis

 
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