Yes, it's just an excuse to make more lists, but which platform comes out on top? I'd say GBA of course! 
Dreamcast
-18-Wheeler American Pro Trucker (Wow Entertainment)
-90 Minutes: Sega Championship Football (Smilebit)
-Alien Front Online (Wow Entertainment)
-Atsumare Guru Guru Onsen (OverWorks)
-BikkuriMan 2000 Viva! Festival! (Sega Toys)
-Biohazard Code: Veronica Perfect (Capcom Studio 4/Nextech)
-Candy Stripe (Wow Entertainment)
-Card Captor Sakura: Tomoyo no Video Taisakusen (Sega Rosso)
-Charge'n Blast (Sims)
-Chu Chu Rocket! (Sonic Team)
-Confidential Mission (Hitmaker)
-Cosmic Smash (Sega Rosso)
-Crazy Taxi (Hitmaker)
-Crazy Taxi 2 (Hitmaker)
-Daytona USA 2001 (Amusement Vision/Genki)
-Derby Tsuku 2 (Smilebit)
-Derby Tsuku: Derby Uma o Tsukurou! (Smilebit)
-Dream Studio (Nextech)
-Dynamite Cop (Wow Entertainment)
-F355 Challenge: Corsa Rosa (Sega-AM2)
-Fighting Vipers 2 (Sega-AM2/Genki)
-Floigan Brothers Vol. 1 (Visual Concepts)
-Guru Guru Onsen 2 (OverWorks)
-Guru Guru Onsen 3 (OverWorks)
-Hanagumi Taisen Columns 2 (Wow Entertainment/Red Entertainment)
-Headhunter (Amuze)
-Hello Kitty no Lovely Fruits Park (Sega Toys)
-Hello Kitty no Magical Block (Sega Toys)
-Hello Kitty no Waku Waku Quiz (Sega Toys)
-Hundred Swords (Smilebit)
-J-League Soccer Club wo Tsukurou! (Smilebit)
-Jet Grind Radio (Smilebit)
-Kita-e: Diamond Dust (Red Entertainment)
-Motto Pro Yakyuu Team o Tsukurou! (Smilebit)
-Net Golf (Wow Entertainment)
-Ooga Booga (Visual Concepts)
-Outtrigger (Sega-AM2)
-Phantasy Star Online (Sonic Team)
-Phantasy Star Online Ver. 2 (Sonic Team)
-Pro Yakyuu Team de Asobou (Smilebit)
-Pro Yakyuu Team de Asobou Net! (Smilebit)
-Pro Yakyuu Team o Tsukurou! (Smilebit)
-Pro Yakyuu Team o Tsukurou! & Asobou! (Smilebit)
-Puyo Pop Fever (Sonic Team)
-Quiz: Ah! My Goddess (Wow Entertainment)
-Resident Evil Code: Veronica (Capcom Studio 4/Nextech)
-Rent A Hero No. 1 (Nextech)
-Rez (United Game Artists)
-Roommania #203 (Wavemaster)
-Segagaga (Hitmaker)
-Sakura Taisen (Red Entertainment)
-Sakura Taisen 2: Kimi Shinitamoukoto Nakare (Red Entertainment)
-Sakura Taisen 3: Bari wa Moeteiruka? (OverWorks/Red Entertainment)
-Sakura Taisen 4: Koiseyo Otome (OverWorks/Red Entertainment)
-Sakura Taisen Online: Paris no Nagai Hibi (Red Entertainment)
-Sakura Taisen Online: Teito no Yuugana Hibi (Red Entertainment)
-Sakura Taisen Song Show: Oogami Ichiro Funtouki (Scarab/Red Entertainment)
-Samba De Amigo (Sonic Team)
-Samba De Amigo Ver. 2000 (Sonic Team)
-Sega Bass Fishing (Wow Entertainment/Sims)
-Sega Bass Fishing 2 (Wow Entertainment)
-Sega GT (Wow Entertainment/Tose Software)
-Sega Marine Fishing (Wow Entertainment/Sims)
-Sega Rally 2: Sega Rally Championship (Sega Rosso/Smilebit)
-Sega Sports Jam (Wow Entertainment)
-Sega Sports NBA 2K (Visual Concepts)
-Sega Sports NBA 2K1 (Visual Concepts)
-Sega Sports NBA 2K2 (Visual Concepts)
-Sega Sports NFL 2K (Visual Concepts)
-Sega Sports NFL 2K1 (Visual Concepts)
-Sega Sports NFL 2K2 (Visual Concepts)
-Sega Sports Tennis 2K2 (Hitmaker)
-Sega Sports World Series Baseball 2K1 (Wow Entertainment/Blue Shift)
-Sega Tetris (Wow Entertainment)
-Shenmue (Sega-AM2/everybody)
-Shenmue II (Sega-AM2/everybody)
-Skies of Arcadia (OverWorks)
-Soccer Tsuku Tokudai Gou: J-League Pro Soccer Club wo Tsukurou! (Smilebit)
-Soccer Tsuku Tokudai Gou 2: J-League Pro Soccer Club wo Tsukurou! (Smilebit)
-Sonic Adventure (Sonic Team)
-Sonic Adventure 2 (Sonic Team)
-Space Channel 5 (United Game Artists)
-Space Channel 5 Part 2 (United Game Artists)
-The House of the Dead 2 (Wow Entertainment)
-The Typing of the Dead (Smilebit)
-Toy Commander (No Cliche)
-Toy Racer (No Cliche)
-Virtua Athlete 2000 (Wow Entertainment)
-Virtua Fighter 3tb (Sega-AM2/Genki)
-Virtua Striker 2 (Amusment Vision/Genki)
-Virtua Tennis: Sega Professional Tennis (Hitmaker)
-Virtual On: Oratorio Tangram (Hitmaker)
-Yu Suzuki Game Works Vol. 1 (Sega-AM2)
-Zombie Revenge (Wow Entertainment)
NeoGeo Pocket Color
-Baseball Stars Color (SNK)
-Big Bang Pro-Wrestling (SNK)
-Billiard Break Shot (ADK)
-Biomotor Unitron (Yumekobo)
-Cool Cool Jam (SNK)
-Crush Roller (ADK)
-Dark Arms: Beast Busters 1999 (ADK)
-Densetsu no Ogre Battle: Zenobia no Ouji (SNK/Quest)
-Dive Alert: Becky's/Matt's Version (Sacnoth)
-Dynamite Slugger (ADK)
-Faselei! (Sacnoth)
-Fatal Fury: First Contact (SNK)
-Graduation Photograph (ADK)
-Melon-Chan Growth Diary (ADK)
-Mokushi Se! Kanji O (SNK)
-Metal Slug: First Mission (SNK)
-Metal Slug: Second Mission (SNK)
-Mizuki Shigeru no Youkai Shashinkan (SNK)
-Neo Pocket Fishing (ADK)
-Neo Turf Masters (SNK)
-NeoGeo Cup '98 Plus Color (SNK)
-Pachi-Slot Aruze Oukoku e-CUP (SNK)
-Pachi-Slot Aruze Oukoku Pocket Volume 9 (SNK)
-Pachi-Slot Aruze Oukoku Pocket: Del Sol 2 (SNK)
-Pachi-Slot Aruze Oukoku Pocket: Ward of Lights (SNK)
-Pachi-Slot Aruze Oukoku Renbaku! Slot Puzzle (SNK)
-Party Mail (ADK)
-Pocket Reversi (SNK)
-Pocket Tennis Color (Yumekobo)
-Puzzle De Pon (SNK)
-Puzzle Link (Yumekobo)
-Puzzle Link 2 (Yumekobo)
-SNK Gals Fighters (Yumekobo)
-SNK Vs Capcom: Card Fighter's Clash Capcom/SNK version (SNK)
-SNK Vs Capcom: Card Fighters Gekitsotu 2: Expand Edition (SNK)
-SNK Vs Capcom: Match of the Millennium (SNK)
-Samurai Shodown! 2 (SNK)
-The King of Fighters R-2 (SNK)
-The King of Fighters: Battle de Paradise (ADK)
-The Last Blade (SNK)
-Thunder V (SNK)
-World Heroes Pocket (ADK)
-Zero Kichi (SNK)
PlayStation 2
-Ape Escape 2 (SCEJ)
-Ape Escape 3 (SCEJ)
-Ape Escape: Pumped & Primed (SCEJ)
-Arc the Lad Generation (Cattle Call)
-Arc the Lad: Twilight of the Spirits (Cattle Call)
-Bakufuu Slash! Kizna Arashi (SCEJ)
-Blood: The Last Vampire (Sugar & Rockets)
-Boku no Natsu Yasumi 2 (SCEJ)
-Bombastic! (Shift)
-Cool Boarders 2001 (Idol Minds)
-Deka Voice (SCEJ)
-DJBox (SCEJ)
-Doko Demo Issyo: Toro to Ippai (SCEJ)
-Doko Demo Issyo: Toro to Nagare Boshi (SCEJ)
-Doko Demo Issyo: Watashi Naehon (SCEJ)
-Downhill Domination (Incog)
-Dropzone: United Peace Force (SCEE Studios Camden)
-Extermination (Deep Space)
-EyeToy: Groove (SCEE Studios London)
-EyeToy: Kinetic (SCEE Studios London)
-EyeToy: Play (SCEE Studios London)
-EyeToy: Play 2 (SCEE Studios London)
-Forbidden Siren (SCEJ)
-Formula One 04 (SCEE Studios Liverpool)
-Formula One 2001 (SCEE Studios Liverpool)
-Formula One 2002 (SCEE Studios Liverpool)
-Formula One 2003 (SCEE Studios Liverpool)
-Ghost Hunter (SCEE Studios Cambridge)
-God of War (SCEA Studios Santa Monica)
-Gran Turismo 3: A-spec (Polyphony Digital)
-Gran Turismo 4: Real Driving Simlutaor (Polyphony Digital)
-Gran Turismo for Boys (Polyphony Digital)
-Gretzky NHL 2005 (Page 44 Studio)
-Hardware: Online Arenas (SCEE Studios London)
-Hot Shots Golf 3 (Clap Hanz)
-Hot Shots Golf Fore! (Clap Hanz)
-Hot Shots Golf Online (Clap Hanz)
-Hungry Ghosts (SCEJ)
-I.Q. REMIX + (Shift)
-ICO (SCEJ)
-Jak 3 (Naughty Dog)
-Jak II (Naughty Dog)
-Jak and Daxter: The Precursor Legacy (Naughty Dog)
-Jet X2O (Killer Game)
-Kinetica (SCEA Studios Santa Monica)
-Legalia: Duel Saga (Contrail)
-Lifeline (SCEJ)
-MLB 2004 (989 Sports)
-MLB 2005 (989 Sports)
-MLB 2006 (989 Sports)
-My Street (Idol Minds)
-NBA ShootOut 2001 (989 Sports)
-NBA ShootOut 2003 (989 Sports)
-NBA ShootOut 2004 (989 Sports)
-NCAA Final Four 2001 (Killer Game)
-NCAA Final Four 2002 (Killer Game)
-NCAA Final Four 2003 (989 Sports)
-NCAA Final Four 2004 (989 Sports)
-NCAA GameBreaker 2001 (989 Sports)
-NCAA GameBreaker 2003 (989 Sports)
-NCAA GameBreaker 2004 (Red Zone)
-NFL GameDay 2001 (Red Zone)
-NFL GameDay 2002 (Red Zone)
-NFL GameDay 2003 (Red Zone)
-NFL GameDay 2004 (Red Zone)
-NHL FaceOff 2001 (989 Sports)
-Otostaz (SCEJ)
-Phase Paradox (SCEJ)
-Pipo Saru 2001 (SCEJ)
-PoPoLoCrois: Hajimari no Bouken (SCEJ)
-Popolocrois: Tsuki no Okite no Bouken (SCEJ)
-Primal (SCEE Studios Cambridge)
-Rise of the Kasai (BottleRocket)
-Rise to Honor (SCEA)
-Saru EyeToy (SCEJ)
-Scandal (Sugar & Rockets)
-Seigi no Mikata (SCEJ)
-Shadow of the Colossus (SCEJ)
-Shibaimichi (SCEJ)
-SingStar (SCEE Studios London)
-SingStar Party (SCEE Studios London)
-SingStar Pop (SCEE Studios London)
-Siren 2 (SCEJ)
-Space Fisherman (SCEJ)
-Syphon Filter: The Omega Strain (Sony Bend)
-The Getaway (SCEE Studios Soho)
-The Getaway: Black Monday (SCEE Studios Soho)
-The Mark of Kri (SCEA Studios San Diego)
-Train Simulator Real: The Keihin Kyuukou (SCEJ)
-Train Simulator Real: The Yamanote Sen (SCEJ)
-Tsugunai: Atonement (Cattle Call)
-TVDJ (SCEJ)
-Twisted Metal: Black (Incog)
-Twisted Metal: Black Online (Incog)
-Waga ga Ryuu wo Miyo: Pride of the Dragon Peace (SCEJ)
-War of the Monsters (Incog)
-WipEout Fusion (SCEE Studios Liverpool)
-World Tour Soccer 2002 (SCEE Studios Soho)
-World Tour Soccer 2003 (SCEE Studios Soho)
-World Tour Soccer 2005 (SCEE Studios Soho)
-World Tour Soccer 2006 (SCEE Studios London)
Game Boy Advance
-Advance Wars (Intelligent Systems)
-Advance Wars 2: Black Hole Rising (Intelligent Systems)
-Custom Robo Ace (Noise)
-Custom Robo GX (Noise)
-Cyberdrive ZOIDS (NdCube)
-F-Zero: Climax (Dentsu)
-F-Zero: Maximum Velocity (NdCube)
-Fire Emblem (Intelligent Systems)
-Fire Emblem: Fuuin no Tsurugi (Intelligent Systems)
-Fire Emblem: The Sacred Stones (Intelligent Systems)
-Hamtaro: Ham-Ham Heartbreak (Nintendo SPD/Pax Soft Nica)
-Kirby & The Amazing Mirror (HAL Labratory/Flagship/Dimps)
-Kirby: Nightmare in Dream Land (HAL Labratory)
-Magical Vacation (Brownie Brown)
-Mario Kart: Super Circuit (Intelligent Systems)
-Mario Vs Donkey Kong (Nintendo Software Technology)
-Metroid Fusion (Nintendo RD1)
-Metroid: Zero Mission (Nintendo RD1)
-Mother 1+2 (Nintendo EAD/Ape)
-Mother 3 (Nintendo EAD)
-Nono No Puzzle Charian (Creatures)
-Pokemon Emerald (Game Freak/Creatures)
-Pokemon FireRed/LeafGreen (Game Freak/Creatures)
-Pokemon Ruby/ Sapphire (Game Freak/Creatures)
-Sakura Momoko no Ukiuki Carnival (Nintendo SPD)
-Sennen Kazoku (Nintendo RD1)
-Super Mario Advance (Nintendo RD2)
-Super Mario Bros. 3: Super Mario Advance 4 (Nintendo RD2)
-Super Mario World: Super Mario Advance 2 (Nintendo RD2)
-Sword of Mana (Brownie Brown)
-The Legend of Zelda: A Link to the Past (Nintendo RD2)
-Wario Land 4 (Nintendo RD1)
-Wario Ware Twisted! (Nintendo RD1)
-Wario Ware, Inc: Mega Microgame$ (Nintendo RD1)
-Yoshi's Island: Super Mario Advance 3 (Nintendo RD2)
GameCube
-1080° Avalanche (Nintendo Software Technology)
-Animal Crossing (Nintendo EAD)
-Cubivore: Survival of the Fittest (Intelligent Systems/Saru Brunei)
-Custom Robo: Battle Revolution (Noise)
-Donkey Kong: Jungle Beat (Nintendo EAD Tokyo)
-Doshin the Giant (Nintendo EAD/Param)
-Doubutsu no Mori e+ (Nintendo EAD)
-Eternal Darkness: Sanity's Requiem (Silicon Knights)
-Fire Emblem (Intelligent Systems)
-Kirby Adventure (HAL Labratory)
-Kirby Air Ride (HAL Labratory)
-Luigi's Mansion (Nintendo EAD)
-Mario Kart: Double Dash!! (Nintendo EAD)
-Metal Gear Solid: The Twin Snakes (KCE Jpn/Silicon Knights)
-Metroid Prime (Retro Studios)
-Metroid Prime 2: Echoes (Retro Studios)
-NBA Courtside 2002 (Leftfield Productions)
-Nintendo Puzzle Collection (Nintendo RD1/Software Technology)
-Pac-Man Vs (Nintendo EAD)
-Paper Mario: The Thousand-Year Door (Intelligent Systems)
-Pikmin (Nintendo EAD)
-Pikmin 2 (Nintendo EAD)
-Pokemon Box: Ruby and Sapphire (Nintendo EAD)
-Pokemon Channel (Ambrella)
-Pokemon Colosseum (Genius Sonority)
-Pokemon Colosseum 2 (Genius Sonority)
-Pool Edge (NdCube)
-Super Mario Sunshine (Nintendo EAD)
-Super Smash Bros. Melee (HAL Labratory)
-The Legend of Zelda (Nintendo EAD)
-The Legend of Zelda: Four Swords Adventures (Nintendo EAD)
-The Legend of Zelda: The Wind Waker (Nintendo EAD)
-Tube Slider: The GP of Future Formula (NdCube)
-Wario Ware Inc. Mega Party Game$ (Nintendo RD1/Intelligent Systems)
-Wave Race: Blue Storm (Nintendo Software Technology)
Xbox
-Amped: Freestyle Snowboarding (Indie Built)
-Amped 2 (Indie Built)
-Brute Force (Digital Anvil)
-Conker: Live and Reloaded (Rare)
-Crimson Skies: High Road to Revenge (FASA Studios)
-Forza Motorsport (MGS Forza Team)
-Grabbed by the Ghoulies (Rare)
-Halo: Combat Evolved (Bungie Software)
-Halo 2 (Bungie Software)
-Inside Pitch 2003 (MGS Sports Team)
-Links 2004 (Indie Built)
-Magatama (MGSJ Team Breakout)
-MechAssault (Day 1 Studios)
-MechAssault 2: Lone Wolf (Day 1 Studios)
-NFL Fever 2002 (MGS Sports Team)
-NFL Fever 2003 (MGS Sports Team)
-NFL Fever 2004 (MGS Sports Team)
-NHL Rivals 2004 (MGS Sports Team)
-Phantom Dust (MGSJ Team Tree)
...as far as accuracy, I'd say the GC/GBA lists are 100%. I feel pretty good about the Xbox list (though I'd like to know the name of the MGS sports team that was shut down/soldoff to UbiSoft). The PS2 list is a nightmare though, I suspect a lot of those 'SCEJ' were actually made by tiny external teams. Let me know if anything's wrong or missing.
Dreamcast
-18-Wheeler American Pro Trucker (Wow Entertainment)
-90 Minutes: Sega Championship Football (Smilebit)
-Alien Front Online (Wow Entertainment)
-Atsumare Guru Guru Onsen (OverWorks)
-BikkuriMan 2000 Viva! Festival! (Sega Toys)
-Biohazard Code: Veronica Perfect (Capcom Studio 4/Nextech)
-Candy Stripe (Wow Entertainment)
-Card Captor Sakura: Tomoyo no Video Taisakusen (Sega Rosso)
-Charge'n Blast (Sims)
-Chu Chu Rocket! (Sonic Team)
-Confidential Mission (Hitmaker)
-Cosmic Smash (Sega Rosso)
-Crazy Taxi (Hitmaker)
-Crazy Taxi 2 (Hitmaker)
-Daytona USA 2001 (Amusement Vision/Genki)
-Derby Tsuku 2 (Smilebit)
-Derby Tsuku: Derby Uma o Tsukurou! (Smilebit)
-Dream Studio (Nextech)
-Dynamite Cop (Wow Entertainment)
-F355 Challenge: Corsa Rosa (Sega-AM2)
-Fighting Vipers 2 (Sega-AM2/Genki)
-Floigan Brothers Vol. 1 (Visual Concepts)
-Guru Guru Onsen 2 (OverWorks)
-Guru Guru Onsen 3 (OverWorks)
-Hanagumi Taisen Columns 2 (Wow Entertainment/Red Entertainment)
-Headhunter (Amuze)
-Hello Kitty no Lovely Fruits Park (Sega Toys)
-Hello Kitty no Magical Block (Sega Toys)
-Hello Kitty no Waku Waku Quiz (Sega Toys)
-Hundred Swords (Smilebit)
-J-League Soccer Club wo Tsukurou! (Smilebit)
-Jet Grind Radio (Smilebit)
-Kita-e: Diamond Dust (Red Entertainment)
-Motto Pro Yakyuu Team o Tsukurou! (Smilebit)
-Net Golf (Wow Entertainment)
-Ooga Booga (Visual Concepts)
-Outtrigger (Sega-AM2)
-Phantasy Star Online (Sonic Team)
-Phantasy Star Online Ver. 2 (Sonic Team)
-Pro Yakyuu Team de Asobou (Smilebit)
-Pro Yakyuu Team de Asobou Net! (Smilebit)
-Pro Yakyuu Team o Tsukurou! (Smilebit)
-Pro Yakyuu Team o Tsukurou! & Asobou! (Smilebit)
-Puyo Pop Fever (Sonic Team)
-Quiz: Ah! My Goddess (Wow Entertainment)
-Resident Evil Code: Veronica (Capcom Studio 4/Nextech)
-Rent A Hero No. 1 (Nextech)
-Rez (United Game Artists)
-Roommania #203 (Wavemaster)
-Segagaga (Hitmaker)
-Sakura Taisen (Red Entertainment)
-Sakura Taisen 2: Kimi Shinitamoukoto Nakare (Red Entertainment)
-Sakura Taisen 3: Bari wa Moeteiruka? (OverWorks/Red Entertainment)
-Sakura Taisen 4: Koiseyo Otome (OverWorks/Red Entertainment)
-Sakura Taisen Online: Paris no Nagai Hibi (Red Entertainment)
-Sakura Taisen Online: Teito no Yuugana Hibi (Red Entertainment)
-Sakura Taisen Song Show: Oogami Ichiro Funtouki (Scarab/Red Entertainment)
-Samba De Amigo (Sonic Team)
-Samba De Amigo Ver. 2000 (Sonic Team)
-Sega Bass Fishing (Wow Entertainment/Sims)
-Sega Bass Fishing 2 (Wow Entertainment)
-Sega GT (Wow Entertainment/Tose Software)
-Sega Marine Fishing (Wow Entertainment/Sims)
-Sega Rally 2: Sega Rally Championship (Sega Rosso/Smilebit)
-Sega Sports Jam (Wow Entertainment)
-Sega Sports NBA 2K (Visual Concepts)
-Sega Sports NBA 2K1 (Visual Concepts)
-Sega Sports NBA 2K2 (Visual Concepts)
-Sega Sports NFL 2K (Visual Concepts)
-Sega Sports NFL 2K1 (Visual Concepts)
-Sega Sports NFL 2K2 (Visual Concepts)
-Sega Sports Tennis 2K2 (Hitmaker)
-Sega Sports World Series Baseball 2K1 (Wow Entertainment/Blue Shift)
-Sega Tetris (Wow Entertainment)
-Shenmue (Sega-AM2/everybody)
-Shenmue II (Sega-AM2/everybody)
-Skies of Arcadia (OverWorks)
-Soccer Tsuku Tokudai Gou: J-League Pro Soccer Club wo Tsukurou! (Smilebit)
-Soccer Tsuku Tokudai Gou 2: J-League Pro Soccer Club wo Tsukurou! (Smilebit)
-Sonic Adventure (Sonic Team)
-Sonic Adventure 2 (Sonic Team)
-Space Channel 5 (United Game Artists)
-Space Channel 5 Part 2 (United Game Artists)
-The House of the Dead 2 (Wow Entertainment)
-The Typing of the Dead (Smilebit)
-Toy Commander (No Cliche)
-Toy Racer (No Cliche)
-Virtua Athlete 2000 (Wow Entertainment)
-Virtua Fighter 3tb (Sega-AM2/Genki)
-Virtua Striker 2 (Amusment Vision/Genki)
-Virtua Tennis: Sega Professional Tennis (Hitmaker)
-Virtual On: Oratorio Tangram (Hitmaker)
-Yu Suzuki Game Works Vol. 1 (Sega-AM2)
-Zombie Revenge (Wow Entertainment)
NeoGeo Pocket Color
-Baseball Stars Color (SNK)
-Big Bang Pro-Wrestling (SNK)
-Billiard Break Shot (ADK)
-Biomotor Unitron (Yumekobo)
-Cool Cool Jam (SNK)
-Crush Roller (ADK)
-Dark Arms: Beast Busters 1999 (ADK)
-Densetsu no Ogre Battle: Zenobia no Ouji (SNK/Quest)
-Dive Alert: Becky's/Matt's Version (Sacnoth)
-Dynamite Slugger (ADK)
-Faselei! (Sacnoth)
-Fatal Fury: First Contact (SNK)
-Graduation Photograph (ADK)
-Melon-Chan Growth Diary (ADK)
-Mokushi Se! Kanji O (SNK)
-Metal Slug: First Mission (SNK)
-Metal Slug: Second Mission (SNK)
-Mizuki Shigeru no Youkai Shashinkan (SNK)
-Neo Pocket Fishing (ADK)
-Neo Turf Masters (SNK)
-NeoGeo Cup '98 Plus Color (SNK)
-Pachi-Slot Aruze Oukoku e-CUP (SNK)
-Pachi-Slot Aruze Oukoku Pocket Volume 9 (SNK)
-Pachi-Slot Aruze Oukoku Pocket: Del Sol 2 (SNK)
-Pachi-Slot Aruze Oukoku Pocket: Ward of Lights (SNK)
-Pachi-Slot Aruze Oukoku Renbaku! Slot Puzzle (SNK)
-Party Mail (ADK)
-Pocket Reversi (SNK)
-Pocket Tennis Color (Yumekobo)
-Puzzle De Pon (SNK)
-Puzzle Link (Yumekobo)
-Puzzle Link 2 (Yumekobo)
-SNK Gals Fighters (Yumekobo)
-SNK Vs Capcom: Card Fighter's Clash Capcom/SNK version (SNK)
-SNK Vs Capcom: Card Fighters Gekitsotu 2: Expand Edition (SNK)
-SNK Vs Capcom: Match of the Millennium (SNK)
-Samurai Shodown! 2 (SNK)
-The King of Fighters R-2 (SNK)
-The King of Fighters: Battle de Paradise (ADK)
-The Last Blade (SNK)
-Thunder V (SNK)
-World Heroes Pocket (ADK)
-Zero Kichi (SNK)
PlayStation 2
-Ape Escape 2 (SCEJ)
-Ape Escape 3 (SCEJ)
-Ape Escape: Pumped & Primed (SCEJ)
-Arc the Lad Generation (Cattle Call)
-Arc the Lad: Twilight of the Spirits (Cattle Call)
-Bakufuu Slash! Kizna Arashi (SCEJ)
-Blood: The Last Vampire (Sugar & Rockets)
-Boku no Natsu Yasumi 2 (SCEJ)
-Bombastic! (Shift)
-Cool Boarders 2001 (Idol Minds)
-Deka Voice (SCEJ)
-DJBox (SCEJ)
-Doko Demo Issyo: Toro to Ippai (SCEJ)
-Doko Demo Issyo: Toro to Nagare Boshi (SCEJ)
-Doko Demo Issyo: Watashi Naehon (SCEJ)
-Downhill Domination (Incog)
-Dropzone: United Peace Force (SCEE Studios Camden)
-Extermination (Deep Space)
-EyeToy: Groove (SCEE Studios London)
-EyeToy: Kinetic (SCEE Studios London)
-EyeToy: Play (SCEE Studios London)
-EyeToy: Play 2 (SCEE Studios London)
-Forbidden Siren (SCEJ)
-Formula One 04 (SCEE Studios Liverpool)
-Formula One 2001 (SCEE Studios Liverpool)
-Formula One 2002 (SCEE Studios Liverpool)
-Formula One 2003 (SCEE Studios Liverpool)
-Ghost Hunter (SCEE Studios Cambridge)
-God of War (SCEA Studios Santa Monica)
-Gran Turismo 3: A-spec (Polyphony Digital)
-Gran Turismo 4: Real Driving Simlutaor (Polyphony Digital)
-Gran Turismo for Boys (Polyphony Digital)
-Gretzky NHL 2005 (Page 44 Studio)
-Hardware: Online Arenas (SCEE Studios London)
-Hot Shots Golf 3 (Clap Hanz)
-Hot Shots Golf Fore! (Clap Hanz)
-Hot Shots Golf Online (Clap Hanz)
-Hungry Ghosts (SCEJ)
-I.Q. REMIX + (Shift)
-ICO (SCEJ)
-Jak 3 (Naughty Dog)
-Jak II (Naughty Dog)
-Jak and Daxter: The Precursor Legacy (Naughty Dog)
-Jet X2O (Killer Game)
-Kinetica (SCEA Studios Santa Monica)
-Legalia: Duel Saga (Contrail)
-Lifeline (SCEJ)
-MLB 2004 (989 Sports)
-MLB 2005 (989 Sports)
-MLB 2006 (989 Sports)
-My Street (Idol Minds)
-NBA ShootOut 2001 (989 Sports)
-NBA ShootOut 2003 (989 Sports)
-NBA ShootOut 2004 (989 Sports)
-NCAA Final Four 2001 (Killer Game)
-NCAA Final Four 2002 (Killer Game)
-NCAA Final Four 2003 (989 Sports)
-NCAA Final Four 2004 (989 Sports)
-NCAA GameBreaker 2001 (989 Sports)
-NCAA GameBreaker 2003 (989 Sports)
-NCAA GameBreaker 2004 (Red Zone)
-NFL GameDay 2001 (Red Zone)
-NFL GameDay 2002 (Red Zone)
-NFL GameDay 2003 (Red Zone)
-NFL GameDay 2004 (Red Zone)
-NHL FaceOff 2001 (989 Sports)
-Otostaz (SCEJ)
-Phase Paradox (SCEJ)
-Pipo Saru 2001 (SCEJ)
-PoPoLoCrois: Hajimari no Bouken (SCEJ)
-Popolocrois: Tsuki no Okite no Bouken (SCEJ)
-Primal (SCEE Studios Cambridge)
-Rise of the Kasai (BottleRocket)
-Rise to Honor (SCEA)
-Saru EyeToy (SCEJ)
-Scandal (Sugar & Rockets)
-Seigi no Mikata (SCEJ)
-Shadow of the Colossus (SCEJ)
-Shibaimichi (SCEJ)
-SingStar (SCEE Studios London)
-SingStar Party (SCEE Studios London)
-SingStar Pop (SCEE Studios London)
-Siren 2 (SCEJ)
-Space Fisherman (SCEJ)
-Syphon Filter: The Omega Strain (Sony Bend)
-The Getaway (SCEE Studios Soho)
-The Getaway: Black Monday (SCEE Studios Soho)
-The Mark of Kri (SCEA Studios San Diego)
-Train Simulator Real: The Keihin Kyuukou (SCEJ)
-Train Simulator Real: The Yamanote Sen (SCEJ)
-Tsugunai: Atonement (Cattle Call)
-TVDJ (SCEJ)
-Twisted Metal: Black (Incog)
-Twisted Metal: Black Online (Incog)
-Waga ga Ryuu wo Miyo: Pride of the Dragon Peace (SCEJ)
-War of the Monsters (Incog)
-WipEout Fusion (SCEE Studios Liverpool)
-World Tour Soccer 2002 (SCEE Studios Soho)
-World Tour Soccer 2003 (SCEE Studios Soho)
-World Tour Soccer 2005 (SCEE Studios Soho)
-World Tour Soccer 2006 (SCEE Studios London)
Game Boy Advance
-Advance Wars (Intelligent Systems)
-Advance Wars 2: Black Hole Rising (Intelligent Systems)
-Custom Robo Ace (Noise)
-Custom Robo GX (Noise)
-Cyberdrive ZOIDS (NdCube)
-F-Zero: Climax (Dentsu)
-F-Zero: Maximum Velocity (NdCube)
-Fire Emblem (Intelligent Systems)
-Fire Emblem: Fuuin no Tsurugi (Intelligent Systems)
-Fire Emblem: The Sacred Stones (Intelligent Systems)
-Hamtaro: Ham-Ham Heartbreak (Nintendo SPD/Pax Soft Nica)
-Kirby & The Amazing Mirror (HAL Labratory/Flagship/Dimps)
-Kirby: Nightmare in Dream Land (HAL Labratory)
-Magical Vacation (Brownie Brown)
-Mario Kart: Super Circuit (Intelligent Systems)
-Mario Vs Donkey Kong (Nintendo Software Technology)
-Metroid Fusion (Nintendo RD1)
-Metroid: Zero Mission (Nintendo RD1)
-Mother 1+2 (Nintendo EAD/Ape)
-Mother 3 (Nintendo EAD)
-Nono No Puzzle Charian (Creatures)
-Pokemon Emerald (Game Freak/Creatures)
-Pokemon FireRed/LeafGreen (Game Freak/Creatures)
-Pokemon Ruby/ Sapphire (Game Freak/Creatures)
-Sakura Momoko no Ukiuki Carnival (Nintendo SPD)
-Sennen Kazoku (Nintendo RD1)
-Super Mario Advance (Nintendo RD2)
-Super Mario Bros. 3: Super Mario Advance 4 (Nintendo RD2)
-Super Mario World: Super Mario Advance 2 (Nintendo RD2)
-Sword of Mana (Brownie Brown)
-The Legend of Zelda: A Link to the Past (Nintendo RD2)
-Wario Land 4 (Nintendo RD1)
-Wario Ware Twisted! (Nintendo RD1)
-Wario Ware, Inc: Mega Microgame$ (Nintendo RD1)
-Yoshi's Island: Super Mario Advance 3 (Nintendo RD2)
GameCube
-1080° Avalanche (Nintendo Software Technology)
-Animal Crossing (Nintendo EAD)
-Cubivore: Survival of the Fittest (Intelligent Systems/Saru Brunei)
-Custom Robo: Battle Revolution (Noise)
-Donkey Kong: Jungle Beat (Nintendo EAD Tokyo)
-Doshin the Giant (Nintendo EAD/Param)
-Doubutsu no Mori e+ (Nintendo EAD)
-Eternal Darkness: Sanity's Requiem (Silicon Knights)
-Fire Emblem (Intelligent Systems)
-Kirby Adventure (HAL Labratory)
-Kirby Air Ride (HAL Labratory)
-Luigi's Mansion (Nintendo EAD)
-Mario Kart: Double Dash!! (Nintendo EAD)
-Metal Gear Solid: The Twin Snakes (KCE Jpn/Silicon Knights)
-Metroid Prime (Retro Studios)
-Metroid Prime 2: Echoes (Retro Studios)
-NBA Courtside 2002 (Leftfield Productions)
-Nintendo Puzzle Collection (Nintendo RD1/Software Technology)
-Pac-Man Vs (Nintendo EAD)
-Paper Mario: The Thousand-Year Door (Intelligent Systems)
-Pikmin (Nintendo EAD)
-Pikmin 2 (Nintendo EAD)
-Pokemon Box: Ruby and Sapphire (Nintendo EAD)
-Pokemon Channel (Ambrella)
-Pokemon Colosseum (Genius Sonority)
-Pokemon Colosseum 2 (Genius Sonority)
-Pool Edge (NdCube)
-Super Mario Sunshine (Nintendo EAD)
-Super Smash Bros. Melee (HAL Labratory)
-The Legend of Zelda (Nintendo EAD)
-The Legend of Zelda: Four Swords Adventures (Nintendo EAD)
-The Legend of Zelda: The Wind Waker (Nintendo EAD)
-Tube Slider: The GP of Future Formula (NdCube)
-Wario Ware Inc. Mega Party Game$ (Nintendo RD1/Intelligent Systems)
-Wave Race: Blue Storm (Nintendo Software Technology)
Xbox
-Amped: Freestyle Snowboarding (Indie Built)
-Amped 2 (Indie Built)
-Brute Force (Digital Anvil)
-Conker: Live and Reloaded (Rare)
-Crimson Skies: High Road to Revenge (FASA Studios)
-Forza Motorsport (MGS Forza Team)
-Grabbed by the Ghoulies (Rare)
-Halo: Combat Evolved (Bungie Software)
-Halo 2 (Bungie Software)
-Inside Pitch 2003 (MGS Sports Team)
-Links 2004 (Indie Built)
-Magatama (MGSJ Team Breakout)
-MechAssault (Day 1 Studios)
-MechAssault 2: Lone Wolf (Day 1 Studios)
-NFL Fever 2002 (MGS Sports Team)
-NFL Fever 2003 (MGS Sports Team)
-NFL Fever 2004 (MGS Sports Team)
-NHL Rivals 2004 (MGS Sports Team)
-Phantom Dust (MGSJ Team Tree)
...as far as accuracy, I'd say the GC/GBA lists are 100%. I feel pretty good about the Xbox list (though I'd like to know the name of the MGS sports team that was shut down/soldoff to UbiSoft). The PS2 list is a nightmare though, I suspect a lot of those 'SCEJ' were actually made by tiny external teams. Let me know if anything's wrong or missing.