Question-and-Answer Resource for the Building Energy Modeling Community
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Short answer is no, it is not an IDF editor per se - although it will generate IDF files for EnergyPlus simulations. You'll find a good overview of what OpenStudio offers here.
I haven't tried it out myself, but you may want to look up BLS' Atom package for EnergyPlus. This would likely correspond to what you're after on a Mac.
