The best Photo Manager 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 Managers so hopefully you can find a suitable replacement. Other interesting Photo Manager alternatives to Capture One are digiKam, RawTherapee, Adobe Lightroom and Luminar Neo.
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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.