BatGBA is a Game Boy Advance emulator. Sound is mediocre, and graphics are good. A basic emulator with decent compatibility.
Boycott Advance is one of the best, at the time of this writing, Game Boy Advance emulators with excellent sound and graphics. High compatibility with features such as: frame-skipping and auto-frame-skipping, real BIOS support, load/save States, WAV/MP3 sound recording, input recording, Zip/GZip files support, built-in debugger, and joystick support.
A Game Boy Advance emulator.
Hades is still under heavy development but it aimes to have a decent balance between usability, speed and accuracy.
NanoBoyAdvance is a Game Boy Advance emulator focused on accuracy.
Rascalboy Advance is a Game Boy Advance emulators. Compatibility wasn't to good on this one. Out of 20 games I tested only about half ran well if at all. On the games that did run the sound and graphics where good.