[mikece]

I don't want to renew my (annual) subscription for Lightroom and Photoshop when it's up; ideally I would like to move this workflow Linux (it's one of the few things keeping me on macOS). Are there Linux alternatives besides Darktable and Gimp and are they really able to compete with the Adobe (or Affinity) offerings?

[commoner]

Krita (https://krita.org) is a Linux-compatible alternative to GIMP, Affinity Photo, and Photoshop.

Linux-compatible alternatives to Darktable and Lightroom include digiKam (https://www.digikam.org) and RawTherapee (https://rawtherapee.com).