I don’t know of any. I do like keyboard based workflows so I have VimiumC in firefox which does what you want. A tiling window manager is the solution for the desktop environment part. The tricky part is navigating existing GUI apps.
They all work using macOS’ accessibility API which exposes UI elements for programmatic interaction.
Because linux doesn’t have a unified framework because of our freedom, things like this are very tricky if not practically infeasible (at least as far as I know).
edit: There was also a thing where you divide up the screen recursively with keyboard shortcuts and when the intersection hovered over whatever you want to click you could hit a key and it would generate a mouseclick there. I forgot the name, never tried it either. But a plus is that it doesn’t need applications to implement a certain API to work so it would work system wide.
Does it say “failed external validation” when it thinks it’s illegal? I tried re-uploading a community logo which is a crop of a frame from an anime but it quickly flashed such an error in the corner of the screen. Is anything copyrighted illegal? I have had some images not shown up for a long while, didn’t know this could be it.
The picture for reference: