Darktable is a free open source raw photo processing app for Linux, Mac and Windows, sort of a libre alternative to Adobe's Lightroom.
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You can download it from the project's website at https://www.darktable.org
It is really close to lightroom in its goals and purpose (managing and developing photos), but the processing workflow itself is different. Lightroom knowledge doesn't translate really well in darktable as far as I know.
It's different with audio software where knowledge translates really well between the major daw.
That's honestly what I think the closest term would be. Digital raw developer / raw processor.
It's not meant to be a generic photo editing suite (a la Photoshop), but to take images as captured and do the "post production" tweaks. White balance, exposure compentation, noise removal, color checking, the like.
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