@NunavutBirder@mas.to darktable is absolutely great, has been my photo developer for years. However one important thing to keep in mind coming from Lightroom in particular, it's not just a different app doing the same thing. It has its own philosophy, its own approaches and a lot of legacy as well. Thankfully, it also has good docs explaining things in depth, and a good community producing tutorials and answering questions on https://discuss.pixls.us/. But it's going to be a learning curve.