Check out GB Enhanced, a potential Gameboy emulator.
GB-Enhanced
License(s): Free Version
System(s): Game Boy, Game Boy Color
OS Supported: Windows
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System(s): Game Boy, Game Boy Color
OS Supported: Windows
GBA4iOS
To play Game Boy Advance games on iOS, GBA4iOS is the best emulator you need to have.
System(s): Game Boy, Game Boy Advance, Game Boy Color
OS Supported: iOS
KiGB
KiGB is the first emulator of the Game Boy series which support many different platforms like Windows – Linux – MS-DOS and even Mac.
System(s): Game Boy, Game Boy Color
OS Supported: Linux, Mac OS, Windows
mGBA
mGBA was born in April 2013. From that day to now, games can be run smoothly without having problems.
System(s): Game Boy, Game Boy Advance, Game Boy Color
OS Supported: Linux, Mac OS, Nintendo 3DS Homebrew, PlayStation Vita Homebrew, Wii Homebrew, Windows