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Unfortunately, I don't know of one like Monster Tool (in which it provides a number of helpful target DCs and numbers), but if you're just looking for formatting, there is the similar Template Tools.
When I look to make Hazards with it, I'll find a similar hazard on AoN and copy over the stats and then adjust things using the rules for Building Hazards. While you will have to put them in manually, it is a bit easier since there is less variation in Hazards as opposed to creatures.