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 tied with our September mention as $79 off 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 August 15.