The best Photo Editor alternative to Capture One is darktable, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Capture One and many of them are Photo Editors so hopefully you can find a suitable replacement. Other interesting Photo Editor alternatives to Capture One are RapidRAW, digiKam, RawTherapee and Adobe Lightroom.
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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.