Hi, Matt.
I use Photoshop Elements (a cut down version of Photoshop) as my main app with occasional AI help from Topaz Photo AI.
Sadly, I can no longer recommend either of them—at least for hobbyists—because they’ve moved to quasi- or full-subscription models. Until the 2025 version you bought PSE for life; now your purchase is only good for 4 years. Photo AI likewise has been moth-balled with all new purchases as subscriptions to the slightly changed name app, Topaz Photo.
I’ll keep using what I have until they no longer work.
Free ones? GIMP probably lies somewhere between PSE and the full-blown Photoshop in what it can do, especially with its plug-in functionality. Because I’ve learnt on and like PSE, I find GIMP difficult to master. But if you start fresh and persevere I don’t think you’ll go wrong with GIMP. It’s what I’ll go to when my PSE eventually becomes unusable.
If you look through old topics in the sub-board “Photograph Resources, Tips and Tutorials” you’ll find several discussions about software that restorers on here have used or recommended over the years.
Peter