Gambatte
- Open source emulator for Linux and Windows.
- http://sourceforge.net/projects/gambatte/

BoycottAdvance/SDL
- Multi-platform emulator available for Linux, BeOS, WIN32 and FreeBSD.
- http://sdlemu.ngemu.com/basdl.php

GEM
- A freeware emulator for MSX-DOS2 written in assembly.
- http://www.tni.nl/products/gem.html

BGB
- A freeware emulator for Windows.
- http://bgb.bircd.org/

Geek.com: Goby
- Review of a commercial emulator for EPOC.
- http://www.geek.com/hwswrev/psion/goby/

GBE
- Open source port for AmigaOS.
- http://www.amidog.com/amiga/gbe/

GEST
- An open source emulator for Windows.
- http://koti.mbnet.fi/gest_emu/

Phoinix
- An open source (GPL) emulator for PalmOS.
- http://phoinix.sourceforge.net/

KiGB
- A freeware emulator for DOS, Linux/i386, MacOS, and Windows.
- http://kigb.emuunlim.com/

GEX
- A freeware emulator for Windows.
- http://gex.emuunlim.com/

PlayGuy
- A freeware emulator for Windows.
- http://playguy.emuxhaven.net/

confusionGBx
- A freeware emulator for Windows.
- http://confusion.i-networx.de/

QuantumGB
- Freeware emulator for DOS.
- http://quantum.emuunlim.com/quantumgb.htm

D-Boy
- Freeware emulator for DOS.
- http://www.emucamp.com/boukichi/

Game Lad
- Freeware emulator/debugger for Win32/DX8.
- http://gamelad.emuunlim.com/

cingb
- Open source emulator for DOS and Unix.
- http://sourceforge.net/projects/cingb/

Victoly Boy
- Freeware emulator for MacOS.
- http://www2.hawaii.edu/~dereksmi/gameboy.html

TGB
- Freeware emulator for Win32.
- http://gigo.retrogames.com/

HelloGB
- Freeware emulator for Win32.
- http://www.emuunlim.com/hgb/

KGB
- Freeware emulator for Win32.
- http://kgb.emulationworld.com/

NO$GMB
- Shareware emulator for DOS and Win32.
- http://www.work.de/nocash/gmb.htm

Virtual GameBoy
- Commercial emulator for Win32 and freeware emulator for AIX, FreeBSD, Irix, Linux, MacOS, OS/2, OSF/1, Solaris, and SunOS.
- http://fms.komkon.org/VGB/

GBMac
- Shareware emulator for MacOS.
- http://hp.vector.co.jp/authors/VA009321/index2.html