They grab free software, do nothing more than "rebrand" it, and charge $25 for the privilege. Do yourself a favor and avoid these guys like crazy. You can grab fink and FinkCommander to get GIMP, and lots of other stuff, for free, and there's no difference between that and the OpenOSX version, except for the $25 savings from avoiding a bunch of charlatans capitalizing on free software in the worst possible way.