DOWNLOAD:

Mac OS X 10.8.x Mountain Lion: GIMP 2.8.2 for Mountain Lion

Mac OS X 10.6.x Snow Leopard & 10.7.x Lion - 64 bit: GIMP 2.8.2 for Snow Leopard & Lion

Mac OS X 10.6.x Snow Leopard - 32 bit: GIMP 2.8.2 for Snow Leopard

Mac OS X 10.5.x Leopard - still uses X11: GIMP 2.6.11 for Leopard

Mac OS X 10.4.11 Tiger - still uses X11 : GIMP 2.6.11 for Tiger

GIMP 2.8 User Manuals:

GIMP 2.8 User Manual - english

GIMP 2.8 User Manual - german

GIMP 2.6 User Manual - spanish

GIMP 2.8 User Manual - french

GIMP 2.6 User Manuals:

GIMP 2.6 User Manual - english

GIMP 2.6 User Manual - german

GIMP 2.6 User Manual - spanish

GIMP 2.6 User Manual - french