D3Publisher
Dangerious Software
Dark Fox
Data East USA
Data Systems
Datamost
Datasoft
Davidson
Day 1 Studios
DayTerium
DBI Mobile Entertainment
DEC
DECUS
Deep Silver
DelphiForFun
Delphine Software
Delta Tao Software
Desktop Gaming
Destan Entertainment
Destination Software
Destineer
Desura
Device Oriented Games
Dice Games
DICE
DigiRonin
Digital Extremes
Digital Illusions
Digital Image Design
Digital Leisure
Digital Marketing
Digital Praise
Digital Spray Studios
Discovery Software
Disney
Displayed Video
Divo Games
DK
DMA Design
Domark
Donkey Games
Double Fine Productions
Download.com
DPI Productions Inc.
Dream Green
Dreamcatcher Interactive
Dreamers Guild
DreamForge Entertainment
DSI
DTF Games
Dubois And McNamara
DVS
Dynacomp Inc.
Dynamix
Dynofoo
DynoTech Software
Note: bolded names indicate companies that released a game within the last twelve months.