It's been said on Darktable's site and in here that it's not an option for maintaining a catalogue of photos. What would be a good companion app then? Until I

It's been said on Darktable's site and in here that it's not an option for maintaining a catalogue of photos. What would be a good companion app then? Until I figure something out, I'm waiting for Luminar or whatever Lightroom competitor that Affinity Software is going to come out with later in 2018.