Technically speaking, this is not a Freeware since only owners of Sigma cameras could download and use it, but then, we all own a Sigma camera ! Don't we? 
. It has all the basic features of a photo editing tool like adjusting colors, ...
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FREE Download - Sigma Photo Pro Software - free download, freebie ...
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Tags: all-own, basic, find-out, Photo Editing, Photo Review, posted-the-first, review, Sigma, since-only, technically-speaking, the-basic