Raster Graphics
GIMP
... well, I'm out.
(No, but more seriously: I like GIMP's functionality, hate the UI. emacs has a couple modes to make the defaults a lot more ergonomic for people familiar with vim or a text editor not written in the '60s... Has anyone done something equivalent for GIMP to "make this act like Photoshop?" Because I can use it, but I don't have to like, for example, having to go push the "ANCOR" or "STACKIT" layer buttons every time I paste something).