RawTherapee

RawTherapee is a RAW development program with a non-destructive 32-bit floating-point engine, advanced demosaicing algorithms and detailed tools for colour, sharpness and noise reduction. It can also subtract dark frames, apply flat-field correction, fix dead pixels and merge Pixel Shift files. An engineer can use it to develop documentation photos accurately, for technical photography of models and lab tests, and to batch-process a series of images with the same profile. It runs well on weaker computers. Limitation: the many options are hard for beginners, and it has no full library management.