Lightzone

LightZone is a free, open-source digital photo editor software application. It was originally developed as commercial software by the now-defunct Light Crafts. Its main purpose is to handle the workflow, including non-destructive editing when handling images in various RAW formats. LightZone outputs JPEG files which contain metadata references to the original image file location and a record of the transformations applied during editing. It is comparable to Adobe Lightroom.