Krita, rawtherapee, dark table, digikam, affinity. Just depends what you are trying to do. If you’re used to photoshop there’s nothing exactly the same and it will take effort to move but I think it’s worth it, I’m still on the journey of learning as a hobbyist and have mostly been using dark table for photo editing
Darktable is fine as a hobbyist, but it doesn’t fully replace Lightroom when you get into semi-professional and professional workloads.
I need to give it another try, but my 12TB raw file library is so unwieldy to manage that I haven’t tried importing it all there. Plus the AI generative removal and Denoising is pretty important to a lot of my workflows.