Below is the list of the companies with at least a game developed or published on a SEGA console, with a description (in french only), nationality, Web site and statute (active or dead)
A-Wave
Aaronix
Abel
Able Corporation
Absolute Entertainment
Access Software
Acclaim Entertainment
Accolade
Acid Software
ACME Interactive
Active Entertainment
Activision
ADK (Alpha Denshi)
Adrenalin Entertainment
Agetec
Aicom
Airwalk Studios
Aisystem Tokyo
AKI Corp.
Al Baker & Associates
Alchemist
Alexandria Incorporated
Alfa System
Alternative Reality Technologies
Altron
ALU
AM Annex
AM1
AM2
AM7
AM9
Amedio
American Laser Games Inc.
American Softworks Corporation
Amusement Vision
AmuseWorld
Amuze
Anchor
Ancient
Anco Software
Appaloosa Interactive
Aquaplus
Arc Developments
Arc System Works
Archer MacLean
Arena Entertainment
Argonaut
Arnowitz Studios
Arsys Software
Artdink
Artech Studios
ASC Games
ASCII Entertainment
Asciiware
Asmik Corporation
Aspect
Astro Port
Atari Games
ATD
Athena
Atlus
Atmark Corporation
Atod
Atravia Japan
Audiogenic Software
AV Artisan
Avalanche Software
Awesome Developments
Ballistic
Bally/Midway
Bandai
Banpresto
Batlab Electronics
Beam Software
Big Bang Software
Big Evil Corporation
Big Red Software
Bignet USA Inc.
Bimboosoft
BioWare
Bit Managers
Bitmap Brothers
Bitmap Bureau
Bitmasters
BITS Corporation
Bits Laboratory
Bits of Magic
Bizarre Creations
Black Pearl Software
Blaze
BlazePro
bleem !
Blitz Games
Blizzard Entertainment
Blue Planet
Blue Sphere
Blue Turtle
BlueSky
Bottom Up
Brian A. Rice
Broccoli
Broke Studio
Brøderbund
BudgeCo
Buena Vista Interactive
Bullet-Proof Software
Bullfrog
C&E Inc.
C-lab.
C.Y.X.
California Dreams
Capcom
CapDisc
Captivation Digital Laboratories
Caramel Pot
Ceris Software
Chime
Chris Gray Enterprises
Chuanpu
Chuanpu Technologies
Cinemaware
City Connection
City Man Technologies Co., Ltd.
Climax Entertainment
Climax Graphics
Clockwork Games
Clover Software
Coconuts Japan
Code Monkeys
Code To Go
Codemasters
Columbus Circle
Compile
Compile Heart
Compton's New Media
Condor
Core Design
Coreland
Crave Entertainment
Crazy Viking Studios
CRC Research Institute
Creative Capers
CREATON SOFTEC INC.
Crimson
Criterion Games
Crossnet
Cryo
Cryptic Allusion
Crystal Dynamics
CSK Research Institute
CSW Verlag
Cyan
Cyber Front
D3Publisher
DahJee
Daiki
Daikoku
Daou Infosys Corp.
DAPS
DarkWorks
Data Design
Data East
Data West
Datam Polystar
Davidson & Associates
Dazz Co Ltd
Deep Water
Delphine Software
Den'no Shokai
Deniam
Denpa Shinbunsha
Designer Software
Developer Resources
Digital Concept
Digital Developments
Digital Eclipse
Digital Illusions
Digital Pictures
Dimps
Dini and Dini Productions
Discovery Software
Disney Interactive
Disney Software
DMA Design
Domark
Dorasu
DragonBox
Dragons Team
Dream Guardians
Dreamworks
Drew Pictures
Dry Ice
Duranik
Dynamic Planning
Dynamix
Earthly Soft
East Point Software
Ecole
Eden Entertainment
Eden Studios
Eidos
Eighting
Electro Brain
Electronic Arts
Electronic Arts Victor
Empire Interactive Entertainment
EON Digital
Epicenter Interactive
EPYX
Esco Boueki
ESP
Eurocom Entertainment Software
Evermind
EXA Planning
EXP
Extended Play Productions
Extreme Entertainment Group
F&C
Face
Factor 5
Falcom
Family Entertainment
Far Sight Technologies
First Star Software
Flashback
Flashpoint Productions
Flying Edge
FM
FOG
Foley Hi-Tech Systems
FortyFive
Four-Some
Fox Interactive
François Lecornec
Freestyle Software
From Software
Front Street Publishing (U.S. Gold)
Frontier Developments
Frontwing
FTL
Fuji Television Network
Fujicom
Funcom
FV Ring
G-Rev
G-Sat
Game Arts
Game Freak Inc.
Game Impact
Game Line
Game Refuge
GAME Studios
GameTek
Gamevillage
Gamtec
Gathering of Developers
Gau Entertainment
Gearbox Software
General Entertainment
GeneX
Genki
GGS Studio Creation
GIANTS Software
Givro
Global A
GN Soft
GOAT Store Publishing
Good Deal Games
Graftgold
Granite Bay Software
Gray Matter Interactive
Gremlin Interactive
Gremlin/Sega
Group SNE
GTE Vantage
H.I.C.
Habit Soft
Hackberry
Hammond & Leyland
HarmlessLion
Hasbro Interactive
Havas Interactive
Headgames
Heavy Iron
Hertz
HES
Hi Tech Entertainment
Hi Tech Expressions
HiCOM
High Score Productions
High Voltage Software
HighTech Lab. Japan
Hitmaker
Hitmen Productions
Home Data
Hook Software
Hookstone
Hot-B
Hothouse Creations
HUCAST.net
Hudson Soft
HUMAN
HuneX
HyperDevbox
Icom Simulations
ID Software
Idea Factory
IGS
Iguana Entertainment
Illusion Soft
Illusion Softworks
Image Works
Images Software
Imagineer
Imagineering
Imagitec Design
In Utero
Infini Entertainment Technology
Infinite Laser Dog
Infocom
Infogrames
Innerloop Studios
Innerprise Software
Interact
Interactive Designs
International Games System
Interplay
Interstate
Intuitive Computers
IO Productions
Irem
ISAO
ISCO
J.S.C. Gamos
Jaleco
JAM
JAMP Inc.
Japan System Supply
JMD
Johnson Voorsanger Productions
JoshProd
JP Multimedia Entertainment
JSH
Jumbo
JVC
M2
M2 Shot Triggers
Ma-Ba
Majesco
Malibu Interactive
Mangangá Team
Marionnette
Marsu
Marvelous Entertainment
Masaya
Mass Media
Mathematiques Appliquees
Mattel
Maxbet
Maxis
Mebius
Media Entertainment
Media Factory
Mediaworks
Mega Cat Studios
Melbourne House
Mentrix Software
Metro3D
MGM Interactive
Micro Cabin
Micro World
Microïds
Micronet Co. Ltd
Microprose
Microsmiths
Midnight Synergy
Midway
Mikael Tillander
MIL-CD
Milestone
Millenium Interactive
Minato Giken
Mindscape
Ming Technology Co. Ltd.
Mirage
Mirrorsoft
Mitec
MNM Software
MOSS
MotiveTime Limited
Mucky Foot
Multimedia Creators Network
Namco
Namcot
Natsume
Naughty Dog
Naxat Soft
NEC Interchannel
Neofid Studios
Neon
NetVillage
Never Ending Soft
Neversoft
New World Computing
Nexa Corporation
Nextech
Nextgrand LTD
NG:DEV.TEAM
Nichibutsu
Nihon Bussan
Nihon Falcom
Nihon System
Nihon Telenet
Nippon Computer System (NCS)
NMS Software
No Cliché
Noisa
Notes!
Novotrade
Now Production
Nu FX
Nuvision
Ocean
Odysseus Software
OlderGames
Omiya Soft
Open Corp.
Opera House
Origin Systems
OrionSoft
Overworks
Pacific Software
Pajamas Soft
Palace Software
Palsoft
Panasonic
Pandora Box
Panther Software
Papyrus Design Group
Paradox Development
Park Place Productions
Parker Brothers
PCM
Pelican
Perfect Entertainment
Picorinne soft
Piko Interactive
Pione Soft
Pioneer
Pitbull Syndicate
PiXEL
Pixel Heart
Planet
Play Mechanix
Playmates Interactive
Playmore
PlayOnRetro
Polydor
Polygames
Pony Canyon
Popcorn Soft
Premier International Corporation
Princess Soft
Probe
Psikyo
Psygnosis
Pulse
Punk Development
Quakenbush Design
Quantic Dream
QUByte Interactive
Radiance Software
Radical Entertainment
Rage Software Ltd.
Raizing
Random House
Rare
Raster
Rastersoft
RayLand
RazorSoft
Readysoft
Real3D
Realtec
Realtime Associates
RealVision
Recreational Brainware
Red
Red Storm
Redspotgames
Reflections
Reindeer
Renegade Software
Reno (Nihon Telenet)
Renovation
Retro Souls
Retro-bit
RetroRoomgames
Revival Studios
Riedel Software
Ringler Studios
Riot
Riot (Nihon Telenet)
Ripcord
Rit's
Riverhill Soft
Rocket Science Games
Rockstar
Runecraft
RushOnGame
Rutubo Games
S F Software
S.P.S
Sachen
Saddleback Graphics
Saga Planets
Sage's Creation
Sai-Mate
Sales Curve
Salio
Sammy
Samsung
Sankindo
Sanritsu
Sarupro
Scavenger
SCEE Studio Cambridge
SCI
Sculptured Software
Secret Level Games
SEGA
Sega AM1
Sega AM11
Sega AM12
Sega AM2
Sega AM3
Sega AM4
Sega AM5
Sega AM6 (CS1)
Sega AM7 (CS2)
Sega CS R&D
Sega Development Division #1 (AM1)
Sega Development Division #3
Sega Electronics
Sega Falcom
Sega Interactive Development
Sega Mechatro
Sega Multimedia Studio
Sega of America
Sega Ozisoft
Sega R&D #8
Sega R&D 1
Sega R&D 2
Sega Rosso
Sega Software R&D Dept. 1
Sega Software R&D Dept. 3
Sega Software R&D Dept. 4
Sega Software R&D Dept. 6
Sega Technical Institute
Sega Toys
Sega WOW
Seibu Kaihatsu
Seismic
Senile Team
Sensible Software
Shaba Games
Shangri-La
Sheffield House
Shimada Kikaku
Shiny Entertainment
Shoeisha
Shogakukan Production
Shouei System
Sieco
Sierra
Sierra On-Line
SIGMA
Sik
Silicon & Synapse
Silicon Dreams
Simon and Schuster
SIMS
Skonec
Smilebit
Smoking Gun Productions
SNK
SNK Playmore
Softmax
Softvision
Software Creations Cartridge
Software Toolworks
Sonic Software Planning
Sonic Team
Sony Imagesoft
Sony Music Entertainment
Sound Images
Space Pants Games
Spectrum Holobyte
Spidersoft
Spike
Spiral House
Sprytes Ltd.
SSI
Starfish
Stargate Films
Sterling Silver Software
Sting
Stormfront Studios
Strictly Limited
Studio 128
Studio 3DO
Studio Alex
Studio e go!
Studio Fazzy
Studio Line
Studio Mebius
Studio Wonder Effect
Subtle Style
Success
Sun Green
Sunrise Interactive
Sunset Entertainment
SUNSOFT
Super Chip
Super Fighter Team
SuperSonic Software
Sur De Wave
Swing! Entertainment
SymbioPlanning
Syrox Developments
Syscom
System Sacom
SystemSoft
T&E Soft
TAD
Taito
TAKARA
Take 2 Interactive
Takumi
Takuyo
Talonsoft
Taoplan
TBS
Team 17
Team Bubsy
Team Ninja
Tec Toy
Technical Wave
Technopop
TECHNOS Japan
Technosoft
TecMagik
Tecmo
Teeny Weeny Games
Telenet Japan
Telstar F & G
Tempest Software
Tengen
Teque London
Terminal Reality
The 8-Bit Guy
The AfroMonkeys
The Bitmap Brothers
The Britt Allcroft Company
The Cartoon Mavericks (The Kremlin)
The Kremlin
Thin Chen Enterprise CO. , LTD.
Thinking Cap
Thinking Rabbit
Third Law
THQ
Three-Sixty Pacific Inc.
Tiburon
Tiertex
Time Warner Interactive
Titus Interactive
Toaplan
Toei
ToeJam & Earl Productions
TOHO
Toka
Tommy
Tose Software
Toshiba EMI
Touchstone
Tradewest
Transpegasus
Traveller's Tales
Treasure
Treco
Tremor
Treyarch
Triangle Service
Tsuburaya Prod.
Tsukuda Original
TV-Asahi
Type Moon
Ubi Soft
UDS
UEP System
UFO
Ukiyotei
Ultimate Productions
Unexpected Development
UNIPACC
United Game Artists
UPL
US Gold
Vanguard Works
Varie Corporation
Vatical Entertainment
Vectordean
Viacom New Media
Vic Tokai
Victor Entertainment
Victor Interactive Software
Victor Music Industries
Video System
Virgin Interactive
Virgin Studios London
Virtual Studio
Visco
Visit
Visual Concepts
Vivarium
Vivid Image
Vridge
Waka Manufacturing
Walt Disney Feature Animation
Warashi
Warp
Warthog
Water Melon
WAVE Game Studios
Western Technologies
Westone Bit Entertainment
Westwood Studios
WHITE CLARITY
White Ninja Studios
Whiteboard
Will
Williams Entertainment
Winkysoft
Wisdom Tree
WiZ
Wolf Team
Wonder Amusement Studio
Working Designs
Wow Entertainment (AM1)
X Boy
X-Ray Interactive
Xanth Software F/X
Xicat Interactive
Xilam
Youmex
Yuan Works
Yuke's