Capture One is described as 'Leading raw converter and workflow software which enables photographers to reduce the time and effort required to deliver astounding ready-to-use images with excellent color and detail' and is a Photo Manager in the photos & graphics category. There are more than 50 alternatives to Capture One for a variety of platforms, including Windows, Mac, iPhone, Linux and Android apps. The best Capture One alternative is darktable, which is both free and Open Source. Other great apps like Capture One are RapidRAW, digiKam, Adobe Lightroom and RawTherapee.
Capture One alternatives are mainly Photo Editors, but if you're looking for
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Darktable is the only RAW editor I use. I have tried Rawtherapee but I think D.T. is better. Besides, there is a long learning curve with both and I am more familiar with D.T.