Download of gnuboy 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within Games, more precisely Tools. This free software for Mac OS X was originally created by Mac EmuScene.
From the developer:
gnuboy is a MacOS X compatible Gameboy emulator, that allows you to play Gameboy games on your Mac.
You may want to check out more Mac applications, such as iDistract or Cherry Pick, which might be similar to gnuboy.