Heres the Listing of GBA Emulators

Windows

AGD
BoyCott Advance
Cowbite
DSemu
DSP
Gebea
Ideas
Mednafen
No$GBA
PC Advance
Rascal Boy Advance
Reasonable GBA
VBA2
Virtual Gameboy Advance
Visual Boy Advance
Visual Boy Advance -M
Visual Boy Advance Rerecording
Visual Boy -Hackers
VBA-M
VBA-Minimum
VBA-QT
Linux
BoyCott Advance
Virtual Gameboy Advance
Visual Boy Advance
FreeBSD
Virtual Gameboy Advance
BeOS
BoyCott Advance
SDL
BoyCott Advance
Visual Boy Advance
Macintosh
BoyCott Advance
Gamepark 32
GP Advance
$#@!eGBA
VBA32
Xbox
GBA
GBA X
U VBAX
VBA X
X Boy Advance
Dreamcast
GBA Emu for DC
Java
YahGBA