[paperdigits_]

Impulse noise reduction in RawTherapee is pretty good.

For darktable, there was some changes to noise reduction a few releases ago, and its now recommended to use two instances of the profiled denoise module, on that targets luma noise and one that targets chroma noise. It also works pretty well.

Neither work as well as the DxO prime, which is the best noise reduction I've ever seen.