Game Boy Developer's Kit  
   Software toolkit.
   http://gbdk.sourceforge.net/

GameBoy Guts  
   Photos of contents of cartridges.
   http://uk.geocities.com/gameboycartsuk/index.html

MBC5/CPLD for the Gameboy  
   MBC5 controller for Xilinx cpld.
   http://home1.stofanet.dk/hvaba/gameboy/mbc5cpld/index.html

Reiner Ziegler's Website  
   Information and ReadPlus software for programming original Game Boy carts.
   http://www.reinerziegler.de/

TeamKNOx  
   Hardware side of Game Boy emulation and development.
   http://members.tripod.com/~TeamKNOX/

MQP Game Boy Project  
   Program and information allowing classic books to be read on Game Boy.
   http://www.mqp.com/fun/gb.htm

Pushpin  
   Midi synthesizer kit for Game Boy Color.
   http://www.dsperado.com/pushpin.shtml

Little Sound Dj  
   Game Boy music program containing a sequencer enabling waveform editing or a hardware synthesizer.
   http://www.littlesounddj.com/

The Blue Hippo's Paradise  
   Various cropping and RAM utilities.
   http://bluehippo.freeservers.com/

Game Boy  
   Source code and utilities.
   http://shen.mansell.tripod.com/games/gameboy/gameboy.html

Harry Mulder's Gameboy Development  
   Code and tools for assistance.
   http://www.devrs.com/gb/hmgd/intro.html

SkyRank Games  
   A development team consisting of Pocket PC, GameBoy Color and Advance programmers, musicians and artists. Their goal is to design commercial quality games.
   http://www.skyrank.com

Rednex Gameboy Development System  
   Tool to help with programming.
   http://www.otakunozoku.com/rgbds/index.html

Jeff Frohwein's GameBoy Technical Page  
   Tools and information on development.
   http://www.devrs.com/

Ender-III  
   Various development tools.
   http://www.ender.com/~adam/gameboy/

Ken's Gameboy and PIC Projects Page  
   Utilities and projects.
   http://www.geocities.com/kkaarvik/gameboy.html

WLA DX  
   Macro assembler for the handheld.
   http://www.hut.fi/~vhelin/wla.html

GameBoy Files  
   Source code and tools.
   http://www.personal.triticom.com/~erm/GameBoy/

Gameboy Terminal Server  
   Tool for display usage.
   http://gbts.sourceforge.net/

Game Boy Color Prosound Modification  
   Sound modification directions.
   http://www.littlesounddj.com/prosound/

The Open GameBoy Game Project  
   Open source games.
   http://opengbgames.sourceforge.net/

GBBG Game Boy Beyond Games  
   A web ring for development of non game applications.
   http://d.webring.com/hub?ring=gbbggameboybeyon

The GameBoy Development Ring  
   Webring for developers and sites about developing.
   http://D.webring.com/hub?ring=gameboydev

The Fountain Of Decay  
   Code editor and source code.
   http://members.lycos.co.uk/GBCE/

Programmer-Net  
   Game Boy Programming information and crib sheets.
   http://www.enliten.force9.co.uk/

GB Assembler Studio  
   Tool for fast development.
   http://web.telia.com/~u31802901/nicbit/gameboy.htm

Marat Fayzullin's GameBoy Page  
   Development tools along with game and technical information.
   http://fms.komkon.org/GameBoy/