DxO offers downloads of DxO FilmPack 3 Essential Edition for Windows or Mac for free when you enter your email address here. (You will be sent a unique link to activate the software.) That's the lowest total price we could find by $79 and the best deal we've seen for this photo editing software. It enables you to convert digital photos to black and white, add a grain effect, or alter the color, saturation and contrast to resemble analog film. Deal ends October 31.

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