Microsoft First Party Studios (Source Wiki)
BigPark - Kinect Joy Ride
Good Science Studio - Kinect Adventures
Lionhead Studios - Fable series, Black & White series, The Movies
MGS Family - Untitled Project
MGS Soho - Untitled Project
MGS Mobile Gaming - ilomilo
MGS Vancouver - Untitled Project
Rare Ltd. - Kinect Sports, Banjo-Kazooie series, Viva Piñata, Perfect Dark series
Turn 10 Studios - Forza Motorsport series
Xbox Live Productions - South Park Let's Go Tower Defense Play!
343 Industries - Halo series
Sony Computer Entertainment studios (Source Wiki)
SCE Japan Studio (includes Team Ico and Team Siren) – Ape Escape, Siren, LocoRoco, Patapon, Ico, Shadow of the Colossus, The Last Guardian
Polyphony Digital – Gran Turismo series, Motor Toon Grand Prix 2, Tourist Trophy, Omega Boost
Naughty Dog – Crash Bandicoot series, Jak and Daxter series, Uncharted series
SCE Santa Monica Studio – Kinetica, God of War series, Warhawk with Incognito Entertainment
SCE San Diego Studio – NBA: The Inside, MLB: The Show, ModNation Racers
SCE Bend Studio – Syphon Filter, Resistance: Retribution, Uncharted: Golden Abyss
SCE Foster City Studio
Zipper Interactive – SOCOM: U.S. Navy SEALs series, MAG
SCE London Studio (includes Team Soho) – SingStar, EyeToy, PlayStation Home with SCE Studio Cambridge
SCE Cambridge Studio – MediEvil, PlayTV, Killzone PS Vita, PlayStation Home with SCE London Studio
SCE Studio Liverpool – Wipeout, F1
Evolution Studios – MotorStorm series, World Rally Championship
Bigbig Studios – Pursuit Force, MotorStorm: Arctic Edge, Little Deviants
Guerrilla Games – Killzone series
Media Molecule – LittleBigPlanet series
Novarama - Reality Fighters
Nintendo First Party studios (Source Wiki)
EAD Comprehensive Group –Super Mario 64 DS, Star Fox 64 3D,
EAD Group 1 – Mario Kart series, Nintendogs series, Luigi's Mansion,[38]
EAD Group 2 – Animal Crossing series, Wii-branded games
EAD Group 3 – The Legend of Zelda series
EAD Group 4 – Pikmin series, New Super Mario Bros., Big Brain Academy
EAD Group 5 – Wii Fit, Steel Diver with Vitei
EAD Tokyo – Donkey Kong Jungle Beat, Super Mario Galaxy
Nintendo SPD – WarioWare series, Friend Collection, Rhythm Heaven series, Metroid: Other M with Team Ninja[39]
Nintendo NSD – Personal Trainer: Walking,
Nintendo SDD – Brain Age series
Nintendo Software Technology - Mario vs. Donkey Kong, Crosswords DS, Metroid Prime Hunters[40]
Monolith Soft – Disaster: Day of Crisis, Xenoblade[41]
Retro Studios – Metroid Prime series, Donkey Kong Country Returns[42]
Brownie Brown – Mother 3, A Kappa's Trail
Intelligent Systems – Paper Mario series with Nintendo, Fire Emblem series, Advance Wars series,[43] WarioWare series
Project Sora – Super Smash Bros. Brawl, Kid Icarus Uprising
Nd Cube – Wii Party
HAL Laboratory – Kirby series, Mother series, Super Smash Bros series,
The list speaks for itself. :)