GIMP is not a Photoshop replacement except for pretty basic stuff. There’s no content aware fill, fewer non-destructive edit options, wonky compatibility with PSD files, etc.

Darktable also isn’t a real replacement for a lot of use cases. Lightroom (the non-Classic version) has pretty great cloud syncing and multi-platform apps, so you can do some work on a desktop and then move to a tablet/smartphone or vice-versa. Darktable doesn’t have that kind of flexibility.

Those aren’t drop-in replacements. GIMP for example doesn’t have anything close to Photoshop’s content-aware fill capabilities, I don’t think Krita does either.

Correct me if I’m wrong, but last I checked the Creative Cloud manager/installer for Adobe apps doesn’t work on Wine, because it uses the windows system webview that Wine hasn’t fully replicated. Only pirated copies or installations copied from a Windows machine work.

Photoshop and Lightroom.

There are some useful APIs that Firefox is missing compared to Chromium, like Web Share or Web Bluetooth: https://caniuse.com/?compare=chrome+117,firefox+117&compareCats=CSS,HTML5,JS,JS API

If I’m thinking about projects that could benefit the most from an exponential increase in active developers:

• Wine/Proton (could have a fantastic windows runtime on every *nix platform)
• ReactOS (lot of potential for a windows 7/10 upgrade path)
• Mozilla Firefox (would help with API parity with chromium)
• GIMP (but only if they agree to change the stupid name)

The rest goes to package managers and other lower-level projects that don’t get enough of a spotlight, maybe Brew or Curl or something.