Visual Boy Advance (VBA) is an open source emulator for the Game Boy, Game Boy Color and the Game Boy Advance. The emulator even goes as far to also offer emulation for the Super Game Boy and the Super Game Boy 2. While for the most part the code is built to be cross-platform for a variety of system, the code for non windows systems has been left neglected in the latest forks. Visual Boy Advance is the best choice for emulation of the Game Boy Color and the Game Boy Advance as it offers the best compatibility without sacrificing speed.
While the original branch of Visual Boy Advance has ceased development, there was a few forks that popped up introducing certain features such as the ability to link two Game Boys together through the emulator. These forks were ultimately combined together in a singular for that went by the name Visual Boy Advance – Merge (VBA-M). This fork adds several features while also ensuring the code base was probably maintained and bugs were quenched as they popped up. This has helped ensure the emulator is one of the best choices for the Game Boy systems.