The Gameboy Advance sold 81 million units world wide.
Visual Boy Advance has long since become an open source application and several variants have spawend. We are offering the version we believe functions the best. Like a Gameboy Advance, this emulator can play Gameboy, Gameboy Color and Gameboy Advance games.
NO$GBA is the first Gameboy Advance emulator to support multiplayer games on the same PC. Later versions added support for the NintendoDS. For those reasons it makes our list and a close second to Visual Boy Advance.
higan originally started out as just a Super Nintendo emulator but the author has expanded this emulator to run many other systems. The interface may not be the most friendliest but its abilitiy to emulate many consoles makes higan a neat package.