Virtual GBX
VirtualGBX.com is the premier online destination for playing classic Nintendo Game Boy and Game Boy…
14 Alternatives To Virtual GBX
DroidEmu
DroidEmu is a game system to play SNES, NES, GameBoy Advanced, GameBoy/Color, SEGA GameGear, SEGA…

FCEUX
FCEUX is a Nintendo Entertainment System (NES), Famicom, and Famicom Disk System (FDS) emulator.
JSNES
A JavaScript NES emulator.

Jnes
Jnes is a NES emulator for win32 platforms that uses DirectX for its hardware interface.
MESS
Emulates most gaming systems that exist, emphasizing accuracy over speed.
Mesen
Mesen is a NES/Famicom emulator and NSF player.

My Nes
My Nes is a portable open source NES/FAMICOM emulator written in C#.
NESBox
Nesbox Emulator is a multiplatform emulator of video consoles.
Nesoid
NES emulator for Android phones.
Nestopia
A portable and cycle-accurate NES emulator written in C++

Nintendulator
Nintendulator is an open source Win32 NES emulator written in C++ (plus some assembly optimization).

VirtuaNES
VirtuaNES is Famicom/NES emulator for Win32.

nemulator
nemulator is a NES emulator.

puNES
PuNES is a high accuracy NES emulator.