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You might try OmniGraffle, which is a flowchart generator for Mac. I've only seen it used once or twice so I can't speak to how well it works, but it might fit your bill.
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/7748 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7748 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/