Darktable Photography and Raw Image Developer Software
Darktable is a free open source photography and raw developer software for Linux, Mac OS and freeBSD. Using Darktable you can develop RAW and enhance RAW images. It is released under the GPL 3 licence. It uses fully non-destructive editing mode to edit RAW images. So you your original images are never modified during the edit process. It runs on 4×32-bit floating point pixel buffers. It offers GPU acceleration via OpenCLand has built-in ICC profile support like sRGB, Adobe RGB, XYZ and linear RGB.
