I realize this is old thread, but I've found this tool: http://www.kickstarter.com/projects/...gration-system - it's free and (I think, but not sure) open source. But you should support them by giving them some of your $$$. I knew about it earlier from TIGSource thread, but was in development then yet, so didn't post here. Anyway from what I've played with the tool is very usable although exporting isn't there yet.
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