Rui CarmoSeashore is a Cocoa application based on portions of the GIMP core, and which despite a tendency for largish windows (which would work much better if they were docked or handled as standard tool palettes), is fast bordering on usable:
Seashore is a Cocoa application based on portions of the GIMP core, and which despite a tendency for largish windows (which would work much better if they were docked or handled as standard tool palettes), is fast bordering on usable: