Open source non-destructive RAW editor and virtual darkroom with zoomable lighttable, database-driven organization, HDR and EXR support, floating-point workflow, batch exporting, and advanced editing for photography and scientific imaging across platforms.































































Although it doesn't have a good asset manager, this is the best open-source, Photo ReTouching tool, however with a Steep Learning Curve. Its features more powerful and advance than ACDSEE and even Adobe Lightroom. I've almost switched to it from Adobe Lightroom.