1. Companies starting with D:

      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.